Are We Able to Attribute Differences in Running Ability to Genetics

Are we able to attribute differences in running ability to genetics?

A) Yes, because athletic ability differs between populations, and these populations differ genetically.
B) No, because it would be ethnocentric to suggest that some populations are better than others.
C) Yes, because different kinds of muscle fibers evolved in populations that relied on more physical activity for survival.
D) No, because the relative amount of 'fast twitch' (good for sprinting) and 'slow twitch' (marathon-friendly) muscle is dependent on an individual's muscle activity and exertion.
E) Yes, because culturally biased theories relating differences to incredibly hard work and deep dedication have been disproven.