Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because
The correct option is
C
Asexual reproduction is a type of reproduction by which offspring arise from a single organism, and inherit the genes of that single parent only. During sexual reproduction, fertilization creates a single-celled zygote which includes genetic material from both gametes. Therefore, the complex mixture of genetic material causes a great variation in the offspring.
So, the correct option is Gametes of parents have qualitatively different genetic composition.