Mutations:
a. often change a person's blood from type A to type AB
b. occur only when the DNA is transmitted to a daughter cell
c. are responsible for heritable variations seen in progeny
d. when occurring on a particular Okazaki fragment can lead to different loci

Explanation:

Heritable variations comes from mutations

Mutations are the initial cause of new heritable traits, if we take an example of  a rabbit which can't choose to have a different fur color

Rather, a genetic mutation causes a difference in fur color, which may help that rabbit hide better in its environment

Mutation is one of the causes of natural selection as a result only superior genotype is favored and inferior genotype is eliminated