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To me, the asnwer seems to be B, i.e. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult.
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B makes the most sense here as along with being the authority figure, the person is also their parent. Thus strengthening the link between kids sharing toys because of the authority figure present.
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Answer choice B is correct because with parents, children are more aware of the fact that they need to taker of their siblings. Even parents are telling they should do that more than the non-siblings.
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B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult.

This point connects children sharing things with siblings aka family in presence of an authority. If authority itself is a family member it strengthens it.
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This explanation is posted before the OA is released.

"When an adult was present in the room, the children were more likely to share the toys with their siblings than with non-siblings." And the conclusion derived from this is that, in presence of adults, children prefer sharing toys with siblings to sharing with non-siblings.

A: the toys in the room were new to children, rather than toys they had previously played with at home.
This weakens the conclusion, the children might have shared the toys merely because they were new to them, the 'look what I found' phenomenon.

B. the observing adult was a parent of the siblings, rather than a stranger or non relative adult.
This also weakens the conclusion by limiting the observation conditions which derived a general conclusion relating to all adults/ authority figures.

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys.
This weakens the sharing hypotheses/ conclusion drawn, if the children were only seen to be sharing while they might have actually been helping their siblings out.

D. the room had more toys available than usual, making it easier for children to find and share multiple toys.
This weakens the conclusion, if children had more options to play with, they may find it easy to share the toy with their siblings that they have already played with.

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling.
This does not weaken the conclusion, and might strengthen it, if the adult encouraged the children to share with others and they shared it only with their siblings still, supports the conclusion that children are more inclined to share with family members.

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B should be the answer.
"An authority figure " is indicated when the person is a sibling's parent rather than stranger or non relative adult.

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Only B connects the siblings to their parents
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IMO B

A. the toys in the room were new to the children, rather than toys they had previously played with at home. -Irrevalent

B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult. - Correct

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys. - Out of scope

D. the room had more toys available than usual, making it easier for children to find and share multiple toys. -Incorrect

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling. -Incorrect
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­IMO Choice B

The argument talks about sharing behaviour exhibited by the children when adults are present in the room.
Evidence: With Adult present in the room - Children were more likely to share the toys with the siblings than non-siblings.
Conclusiuon - Children are more inclined to share with family members when they feel they are being observed by an authority figure

Question- Strengthen

Now, observe the detail that children were more likely to share with SIBLINGS
Maybe the adult or authoritative figure is related? which will strengthen. Additionally, the questions asks us to find a choice that supports increased sharing behaviour when ... 

A. the toys in the room were new to the children, rather than toys they had previously played with at home. The qualitative aspect doesn't explain the said behaviour, and how this aspect alters the behaviour is not provided in the argument or passage Incorrect

B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult. Correct The question prompt suggests a line about increased sharing behaviour, and this choice is while in line with the thinking, also helps us identify or reason out this increased sharing behaviour

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys. This choice doesn't talk about the sharing behaviour at all. Additionally, the help needed by younger siblings kind of weaknes the argument by giving us additional details on why the siblings exhibited sharing behaviour Incorrect

D. the room had more toys available than usual, making it easier for children to find and share multiple toys. Number of toys is not a factor. We are only interested to find option choices that strengthen the author's reasoning about sharing behaviour Incorrect

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling. If this were the case, then the sharing behaviour is forced rather than naturally occurring, weakning the reasoning of the argument Incorrect
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The psychologist's argument would be most strengthened if it were true that, during the study, the children exhibited increased sharing behavior when:

A. the toys in the room were new to the children, rather than toys they had previously played with at home.

Whether the toys used are new/ old is irrelevant to the explanation. Author only speaks about sharing pattern under an adult’s supervision

B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult.

Given “when they feel they are being observed by an authority figure”- that means the child must know the person supervising. Let’s put this option aside.

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys.

This does not tell us anything about the reason. Irrelevant.

D. the room had more toys available than usual, making it easier for children to find and share multiple toys.
Irrelevant to the reasoning.

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling
How adults react is not the point of discussion. Rather this is out of context.
So chose B
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Bunuel
Psychologist: In a study, children were observed in a room filled with various toys. When an adult was present in the room, the children were more likely to share toys with their siblings than with non-siblings. This suggests that children are more inclined to share with family members when they feel they are being observed by an authority figure.

The psychologist's argument would be most strengthened if it were true that, during the study, the children exhibited increased sharing behavior when:

A. the toys in the room were new to the children, rather than toys they had previously played with at home.

B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult.

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys.

D. the room had more toys available than usual, making it easier for children to find and share multiple toys.

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling.

 
­Conclusion: Children are more inclined to share with family members when they feel they are being observed by an authority figure.

Task: Strengthen


A. the toys in the room were new to the children, rather than toys they had previously played with at home.
Out of scope, it doesn't matter whether the toys are new are old. They are shared with siblings rather than non-siblings are per the psychologist.

B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult.
It rather hurts the argument as whenever there is an authoritative figure, may it be related or non-related one, kids share their toys with siblings. The above statement means that parent makes the kid share toys with siblings, non-related people won't matter.

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys.
This agains weakens the argument.
The above statement indicates that siblings were new to toys, which made them share it with each other. The cause is not being a sibling, but it is the non-familiarity with the toy.

D. the room had more toys available than usual, making it easier for children to find and share multiple toys.
Irrelevant.
Number of toys is not a concern.

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling.
Apt!
Adult encouraged to share toys with everyone, but the child chose to share it with his or her sibling.
This strengthens. It is in line with the argument and the conclusion.

E is the correct answer
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Option A - This option doesn't address the relationship between the presence of the authority figure and the preference for sharing with siblings over non-siblings.

Option B - This option could suggest that children might behave differently when their own parent is present, but it doesn't directly address the distinction in sharing behavior between siblings and non-siblings due to the presence of any adult authority figure.

Option C - This option suggests that children might share more with siblings due to their perceived need for assistance, rather than the influence of an authority figure's presence.

Option D - This option does not specifically address the influence of the authority figure on the preference for sharing with siblings.

Option E - This directly addresses the influence of the authority figure, as it implies that the observed sharing behavior was influenced by the authority figure's explicit encouragement. However, it does not differentiate the sharing behavior between siblings and non-siblings.

Hence, Answer B
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the answer is E

The parents explicitly encouraged the children to share the toys with siblings/nonsiblings that strengthens the argument because it indicates that the parents did not coerce them in any way.

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Bunuel
Psychologist: In a study, children were observed in a room filled with various toys. When an adult was present in the room, the children were more likely to share toys with their siblings than with non-siblings. This suggests that children are more inclined to share with family members when they feel they are being observed by an authority figure.

The psychologist's argument would be most strengthened if it were true that, during the study, the children exhibited increased sharing behavior when:

A. the toys in the room were new to the children, rather than toys they had previously played with at home.

B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult.

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys.

D. the room had more toys available than usual, making it easier for children to find and share multiple toys.

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling.


­
 


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Answer A:

Conclusion: This suggests that children are more inclined to share with family members when they feel they are being observed by an authority figure

Prephase: A situation that if occur helps solidify the sharing behavior.

A. If it is the case that when all the toys in the rooms are new, children are still sharing their toy as much as or more than before, it is a very good sign that the presence of adult matters. Come to think of it, children can easily share their used toy with other kids just because they are already used to it and have been playing with it for months. But if these same children under this condition are still willing to give out there new toys , it's a clear sign that these kids are under the influences of something.

All other amswr choices are either off points or if true will weaken the conclusion of the hypothesis

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­IMO E because the other choices have nothing to do with the effect an authority figure had on the children
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Since parents of the child will be more authoritative, the sharing behavior would increase, so B.
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Bunuel
Psychologist: In a study, children were observed in a room filled with various toys. When an adult was present in the room, the children were more likely to share toys with their siblings than with non-siblings. This suggests that children are more inclined to share with family members when they feel they are being observed by an authority figure.

The psychologist's argument would be most strengthened if it were true that, during the study, the children exhibited increased sharing behavior when:

A. the toys in the room were new to the children, rather than toys they had previously played with at home.

B. the observing adult was a parent of the siblings, rather than a stranger or non-relative adult.

C. the siblings were younger and appeared to need help understanding how to use the toys, compared to non-siblings who were adept at using the toys.

D. the room had more toys available than usual, making it easier for children to find and share multiple toys.

E. the adult explicitly encouraged the children to share, regardless of whether the other child was a sibling or a non-sibling.


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This question was provided by GMAT Club
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­Option B because it would strengthen the conclusion by clarifying that the adult present in the room was indeed considered an authority figure by children. As children may not consider every adult an authority figure, especially if they don't know them.
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