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Researchers have recently discovered that approximately 70% of restaur

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Researchers have recently discovered that approximately 70% of restaur [#permalink]

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Researchers have recently discovered that approximately 70% of restaurant lemon wedges they studied were contaminated with harmful microorganisms such as bacteria and fungal pathogens. The researchers looked at numerous different restaurants in different regions of the country. Most of the organisms had the potential to cause infectious disease. For that reason, people should not order lemon wedges with their drinks.

Which of the following, if true, would most weaken the conclusion above?

A. The researchers could not determine why or how the microbial contamination occurred on the lemon wedges.

B. The researchers failed to investigate contamination of restaurant lime wedges by harmful microorganisms.

C. The researchers found that people who ordered the lemon wedges at restaurants were equally likely to contact the diseases caused by the discovered bacteria as were people who did not order lemon wedges.

D. Health laws require lemons to be handled with gloves or tongs, but the common practice for waiters and waitresses is to handle them with their bare hands.

E. Many factors affect the chance of an individual contracting a disease by coming into contact with bacteria that have nothing to do with lemons. These factors include things such as health and age of the individual, as well as the status of their immune system.
[Reveal] Spoiler: OA

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Re: Researchers have recently discovered that approximately 70% of restaur [#permalink]

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New post 12 Apr 2017, 22:48
The correct answer is option C
Option C introduces a new piece of information (people who ordered the lemon wedges were equally likely to contact the disease as were people who did not order lemon wedges) which justifies the erroneous conclusion drawn by researchers.
Also, the conclusion of the passage (people should not order lemon wedges with their drinks...due to contamination) is weakened as the correct answer states that people who do not order lemon wedges are also equally at a risk of contracting the disease as that of people who do order lemon wedges.

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Re: Researchers have recently discovered that approximately 70% of restaur [#permalink]

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New post 13 Apr 2017, 11:48
veteranrookie wrote:
(C) ?

Sent from my CP8298_I00 using GMAT Club Forum mobile app


Hi,

yes in this Case answer choice C is the correct one because of the following reasons:

First the conclusion is people shouldn´t order lemon wedges
Premise:70% lemon wedges are contaminated

Which of the following, if true, would most weaken the conclusion above?

A. The researchers could not determine why or how the microbial contamination occurred on the lemon wedges.(This doesn´t hurt the argument)

B. The researchers failed to investigate contamination of restaurant lime wedges by harmful microorganisms. (out of scope)

C. The researchers found that people who ordered the lemon wedges at restaurants were equally likely to contact the diseases caused by the discovered bacteria as were people who did not order lemon wedges. (This offers an alternative explanation or cause. That is, if people who did not order lemon wedges were equally likely to contact diseases, then there must be something else producing bacteria).

D. Health laws require lemons to be handled with gloves or tongs, but the common practice for waiters and waitresses is to handle them with their bare hands. (out of scope)

E. Many factors affect the chance of an individual contracting a disease by coming into contact with bacteria that have nothing to do with lemons. These factors include things such as health and age of the individual, as well as the status of their immune system. (out of scope)

If you liked the explanation please give me some Kudos!
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Re: Researchers have recently discovered that approximately 70% of restaur [#permalink]

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New post 03 Dec 2017, 19:45
hazelnut wrote:
Researchers have recently discovered that approximately 70% of restaurant lemon wedges they studied were contaminated with harmful microorganisms such as bacteria and fungal pathogens. The researchers looked at numerous different restaurants in different regions of the country. Most of the organisms had the potential to cause infectious disease. For that reason, people should not order lemon wedges with their drinks.

Which of the following, if true, would most weaken the conclusion above?

A. The researchers could not determine why or how the microbial contamination occurred on the lemon wedges.

B. The researchers failed to investigate contamination of restaurant lime wedges by harmful microorganisms.

C. The researchers found that people who ordered the lemon wedges at restaurants were equally likely to contact the diseases caused by the discovered bacteria as were people who did not order lemon wedges.

D. Health laws require lemons to be handled with gloves or tongs, but the common practice for waiters and waitresses is to handle them with their bare hands.

E. Many factors affect the chance of an individual contracting a disease by coming into contact with bacteria that have nothing to do with lemons. These factors include things such as health and age of the individual, as well as the status of their immune system.


Conclusion of the statement: 70% of restaurant lemon wedges are contaminated therefore people should not order lemon wedges. Looking for the answer choice that weakens the conclusion that people should not order lemon wedges.

A. The researchers could not determine why or how the microbial contamination occurred on the lemon wedges.
Eliminate- this doesn't weaken or strengthen the argument

B. The researchers failed to investigate contamination of restaurant lime wedges by harmful microorganisms.
Eliminate- we are specifically looking for information about lemons so information about lime wedges is irrelevant.

C. The researchers found that people who ordered the lemon wedges at restaurants were equally likely to contact the diseases caused by the discovered bacteria as were people who did not order lemon wedges.
Keep- This answer says that people who order lemon wedges are equally likely to contact the disease as people who do not order the lemon wedges. This means that there is an alternate reason aside from the lemons wedges that people are getting the disease.

D. Health laws require lemons to be handled with gloves or tongs, but the common practice for waiters and waitresses is to handle them with their bare hands.
Eliminate- irrelevant

E. Many factors affect the chance of an individual contracting a disease by coming into contact with bacteria that have nothing to do with lemons. These factors include things such as health and age of the individual, as well as the status of their immune system.
Eliminate- this doesn't give us a reason why people should not order lemon wedges in order to prevent contacting a disease and is therefore out of scope.

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Re: Researchers have recently discovered that approximately 70% of restaur   [#permalink] 03 Dec 2017, 19:45
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