Mutations are always

a. Good

b. Bad

c. Neutral

d. Natural occurrences

D

Explanation:

Mutations can be good, bad, or neutral so the answer must be d, that they occur naturally. In any given environment many mutations can occur, but the mutation's effect on an ecosystem or being can vary. Mutation happen to people, diseases, animals, and even plants.

C (if it works)

Explanation: Why are most mutations neutral? Neutral mutation. Neutral mutations are changes in DNA sequence that are neither beneficial nor detrimental to the ability of an organism to survive and reproduce. In population genetics, mutations in which natural selection does not affect the spread of the mutation in a species are termed neutral mutations.