He disproportionately high appearance of polydactylism among the amish suggests that a. it is a common mutation

nope its not A (if that what you were trying to say)

He disproportionately high appearance of polyactylism among the Amish suggests that it was over represented in the gene pool of the original Amish settlers.

it is c

Explanation:

a. by using fur or clothes to trap heat energy near the body

satellites are frequently used to make observations of the orbit on earth