The Relatively Large Number of New Mutations That Occur in the Human

The relatively large number of new mutations that occur in the human genome in each generation is tolerable because:

A) we have excellent DNA repair mechanisms.
B) most of the mutations occur in somatic cells, not germ cells.
C) most of our genome is noncoding DNA, so few mutations affect our proteins.
D) we have excellent protein repair mechanisms.
E) compared to other organisms, changes in our proteins have relatively little effect on our cells' structures and functions.