What is a source of variation in asexual reproduction?

A) crossing over of chromosomes

B) mutation of DNA

C) random assortment of chromosomes

D) there is no variation in asexual reproduction

When alleles are recombined during sexual reproduction, they can produce dramatically different phenotypes. Thus, sexual reproduction is a major source of variation within many population. Asexual production is when there is one parent that produces offspring that are identical to the parent. Basically a copy of the parents DNA.

Your answer in short is B