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The proportion of fat calories in the diets of people who read the nutrition labels on food products is significantly lower than it is in the diets of people who do not read nutrition labels. This shows that reading these labels promotes healthful dietary behavior.

The reasoning in the argument above is flawed in that the argument
(A) illicitly infers a cause from a correlation - CORRECT. Yes, it mixes up the two which may not true.
(B) relies on a sample that is unlikely to be representative of the group as a whole - WRONG. Sample size is not an issue.
(C) confuses a condition that is necessary for a phenomenon to occur with a condition that is sufficient for that phenomenon to occur - WRONG. Neither necessary nor sufficient.
(D) takes for granted that there are only two possible alternative explanations of a phenomenon - WRONG. Which two explanations..! Not that any we can see in the passage.
(E) draws a conclusion about the intentions of a group of people based solely on data about the consequences of their behavior - WRONG. Irrelevant. 

Answer A.
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­I am still confused why not C.
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Fenny
­I am still confused why not C.
­If you want to understand necessary and sufficient condition then this link may help.

https://gmatclub.com/forum/necessary-co ... l#p2619211

There are many links but youy have to do the hard work to find them.

Or else try as many questions on this concept to get a hang of it.
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