Answer: A. The green insect population will increase and the yellow insect population will decrease.
Step-by-step explanation:
Natural selection is a phenomena of differential survival and reproduction. In this the individuals in the population of the species having beneficial phenotypic traits will survive and reproduce in adverse environmental conditions.
According to the given situation, the green insect population will increase due to the fact that they have green color which mimics the lush green canopy of rainforest. Thus will remain undetected by the predators. But yellow insects can be detected and will be consumed by the predators. Hence, the population of yellow insect will decrease.
This can be concluded that Green color is a better phenotypic trait over yellow among insects of rainforest living in lush green canopy.