Sometimes There Is a Mistake Made When DNA Is Copied

Sometimes there is a mistake made when DNA is copied. This is called a mutation. Which of the following is true about mutations.

A) A mutation is always a disaster because then the DNA doesn't work and the organism it's part of doesn't work.
B) A mutation is always a good thing because it creates diversity in organisms.
C) A mutation is sometimes good and sometimes bad, depending what the change means for how the DNA works.
D) A mutation is sometimes good and sometimes bad depending on whether it still allows for cell division.
E) A mutation never really makes any difference because DNA can repair itself.