Research on Trends in Average Height During the Twentieth Century

Multiple Choice

Research on trends in average height during the twentieth century shows that height in the Western European population has increased gradually overall.However,there were periods of population decline,such as during World War I and World War II,when food was scarce.These data suggest that

A) nutrition can affect height development.
B) genetics plays no role in height development.
C) genetics plays a large role in height development.
D) hormones are responsible for height development.