Researchers recently studied the relationship between diet and mood, using ... ...

Researchers recently studied the relationship between diet and mood, using a diverse sample of 1,000 adults. It was found that those who ate the most chocolate were the most likely to feel depressed. Therefore, by reducing excessive chocolate consumption, adults can almost certainly improve their mood.

The argument is most vulnerable to criticism on which one of the following grounds?


(A) It improperly infers from the fact that a substance causally contributes to a condition that a reduction in the consumption of the substance is likely to eliminate that condition.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT72 (Jun 2014): Logical Reasoning A