Suppose That Two Mosquito Populations Are Being Studied

Suppose that two mosquito populations are being studied. The populations differ in their choice of aquatic environments in which they choose to lay their eggs. One population is urban and avoids laying eggs in water treated with insecticides, which are heavily used in urban areas. The other population does not discriminate between insecticide-treated and untreated water. Which of the following is a proximal explanation for the observed difference between these populations?

A) The two populations show a consistent genetic difference in a particular genomic region.
B) Individuals in the insecticide-avoiding population produce more offspring.
C) Taste receptors in the insecticide-avoiding population detect insecticide whereas in the other population they do not.
D) Male offspring that develop in insecticide-treated water fail to develop functional sperm.