Average Height of College Students Increased Throughout the 20th Century

Question

Average height of college students increased throughout the 20th century because
A) more students attended college.
B) more tall students attended college.
C) more short students went into military service instead of college.
D) nutrition improved greatly in that time.
E) many mutations conferring great height occurred during that time period.

Accepted Answer

The best explanation is that nutrition improved greatly throughout the 20th century, which led to an increase in average height among college students. This is supported by research showing that improvements in nutrition can lead to an increase in height. The other options are less likely to have had a significant impact on the increase in average height.