Section: Logical Reasoning

33) Nutritionist:Recent studies show that the height of the average American has increased 2 inches in the past 10 years, lending support to the view that modern foods stimulate growth.

The argument would be strengthened by pointing out that

statistical studies were done on which foods were eaten
modern foods are unhealthy
all average heights are increasing
comparisons have been studied in control groups
there is no such thing as an average American

Explanation

(B) and (E) weaken the argument, (A) repeats the argument, and (C) makes no sense, since "average height" is a single composite of all heights.

This question is provided by Barrons Educational Series.