Each species of moth has an optimal body temperature for effective flight, and when
air temperatures fall much below that temperature, the moths typically have to remain
inactive on vegetation for extended periods, leaving them highly vulnerable to
predators. In general, larger moths can fly faster than smaller ones and hence have a
better chance of evading flying predators, but they also have higher optimal body
temperatures, which explains why ______.
A. large moths are generally able to maneuver better in flight than smaller moths
B. large moths are proportionally much more common in warm climates than in
cool climates
C. small moths are more likely than large moths to be effectively camouflaged
while on vegetation
D. large moths typically have wings that are larger in proportion to their body size
than smaller moths do
E. most predators of moths prey not only on several different species of moth but
also on various species of other insects

I am highly confused between choice A and B.....Kindly please help me on this one....