Why are diseases spread by pests in tropical areas likely to spread north in the US?

A. People are more likely to be bitten by mosquitoes when the temperatures are warm (incorrect)
B. The northern species of mosquitoes are more infective when the weather is warm.
C. Infected people spread diseases more readily when the temperatures are warm
D. Warming weather from climate change will cause tropical pests to spread outside of their current geographic region

Please answer correctly.