GMAT Critical Reasoning (CR) | Re: Advertisement: Attention pond owners! Ninety-eight percent of mosquito

Hi,

How come "A" is not the correct answer?

I believe that the population of mosquitoes can be curtailed by only limiting the population of larvae in the area.
As the stimulus mentioned that 98%(Almost all) of the larvae can be destroyed by BTI, therefore,the evident assumption is that the population of mosquitoes can be most effectively controlled by limiting the population of the larvae.

Moreover, for option"E", we are not concerned with the food or prey of fishes,frogs