Given All the Bad Things That Mutations Do, It Seems

Multiple Choice

Given all the bad things that mutations do, it seems counterintuitive that a low rate of mutation is actually good. What good could possibly come of mutation?

A) Mutation is essential if populations are to evolve over time.
B) Mutation is needed for DNA to encode proteins.
C) Mutation is needed when we are fighting an infection.
D) Mutation is essential to prevent cancer.
E) Mutation is needed if DNA is ever to be replicated.