If an Insecticide Like DDT Were Found That Killed Mosquitoes

If an insecticide like DDT were found that killed mosquitoes but was otherwise perfectly safe, would the problem of malaria infection be solved for good?

A) There's no way to know for sure, but we could try it.
B) Yes. The problem would be solved.
C) Yes, but a safe insecticide is probably impossible to produce.
D) No. Malaria comes from organisms other than mosquitoes.
E) No. There would be some resistant mosquitoes, and those would live to create an increasingly resistant population until the insecticide no longer worked on them.