Asexual reproduction is incorrect because genetic variation comes from sexual reproduction. This is due to the fact that both parents pass their genes to the offspring. Asexual reproduction is just copying the parent's genes. Furthermore, Asexual reproduction has only one parent whereas Sexual Reproduction has two, the question says parents as in plural.
The answer that it gives, asexual reproduction, is wrong. Genetic variation in organisms comes from sexual reproduction. Offspring recieve their genes from their parents, each of which give certain traits to the baby. Also, sea stars don’t even reproduce asexually, so this answer doesn’t make any sense.