The correct option is C Parthenogenesis
Aphids thrive on the basis of their number. Their technique to survive a predator is by outnumbering them. Thus, Aphids are good at reproduction, both sexual and asexual. They reproduce by sexual methods when the food is available. The Asexual method is called, parthenogenesis, which occurs when there is a scarcity of the food. With a few exceptions, all aphids are females in spring and summer, that expand exponentially. Thus, the correct answer is option C.