Mutations Are the Most Important Source of Variety on Which

Mutations are the most important source of variety on which natural selection depends and operates.There are two forms of mutations,

A) both discovered by Mendel.
B) cancer-causing mutations and chromosomal rearrangement.
C) and both occur only during the development of an individual.
D) called base substitution mutation and chromosomal rearrangement.
E) and both always result in phenotypic change.