21) C

Franco’s study does not specify exactly when people started exercising.

A – Wrong
Not a conclusion as there is no mention of when people started exercising.

B – Wrong
The statement cannot be a reason for the conclusion.

C – Correct
The evidence given in the passage does not support about when people start exercising.

D – Wrong
The statement given in the question does not explain anything

E – Wrong
The statement given in the question does not counter Franco’s study

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