"men are as prone to buying on impulse as women"
This means there are "Some men" and "some women" who buy on impulse.
So, option A is true.
Option B is false as the passage does not say all men and women buy on impulse.
Option C is false as "Few" means almost none and "prone to buying" means the number is not so insignificant.
Option D can be debated as correct as the meaning of "many" can be ambiguous. Still option A is a safer pick.
Correct Answer: Option A.