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Bunuel
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(A) the study’s card game does not test cognitive abilities other than perception and memory - we need only perception and memory, cognitive abilities is out of scope

(B) card games are among the most difficult cognitive tasks one can attempt to perform - strengthening the conclusion

(C) perception and memory are interrelated in ways of which we are not currently aware - out of scope

(D) the belief that 80-year-olds’ perception and memory are reduced results from prejudice against senior citizens - out of scope

(E) playing the study’s card game perfectly requires fairly low levels of perception and memory - Correct -weakening the conclusion
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my reasoning - A - the passage is talling specifically about perception and memory , a option negate the main idea
B - the question asks which fails to consider - if cards were the most difficult game it would have been a great test to test memory and perception
C - out of scope
D - this statement about the perception is a premise and a fact how can we sauy that its false , just like how sun rises from the east
E - this option direclty questions the games ability to judge someones perception thus correct

I MAY BE INCORRECT , FEEL FREE TO CORRECT MY REASONING .
Bunuel
It is widely believed that by age 80, perception and memory are each significantly reduced from their functioning levels at age 30. However, a recent study showed no difference in the abilities of 80-year-olds and 30-year-olds to play a card game devised to test perception and memory. Therefore, the belief that perception and memory are significantly reduced by age 80 is false.

The reasoning above is most vulnerable to criticism on the grounds that it fails to consider the possibility that

(A) the study’s card game does not test cognitive abilities other than perception and memory

(B) card games are among the most difficult cognitive tasks one can attempt to perform

(C) perception and memory are interrelated in ways of which we are not currently aware

(D) the belief that 80-year-olds’ perception and memory are reduced results from prejudice against senior citizens

(E) playing the study’s card game perfectly requires fairly low levels of perception and memory
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