What Best Explains the Difference in Ability Between Kenyan Track

Multiple Choice

What best explains the difference in ability between Kenyan track and field athletes (runners) and the rest of us?

A) They are born with more leg muscles than people from other populations.
B) They work very hard at running, beginning at a young age.
C) They have a gene for running that others do not have.
D) They get rides everywhere, preserving their energy for running.
E) They have many other career options.