Which of the Following Will Result in Diversifying Selection

Which of the following will result in diversifying selection?

A) Giraffes with the longest necks can eat leaves from the tallest trees.
B) Male frogs that call softly do not attract mates,whereas those who call very loudly get eaten by predators.
C) In an environment with patches of black and white rocks,both black and white rabbits can hide,but gray rabbits are always visible and are eaten by predators.
D) Blue birds with fewer than four chicks do not pass on many genes,blue birds with four chicks can raise them all,and blue birds with more than four chicks risk all of them dying due to lack of food.
E) Black and white moths exist in an area where the trees on which they rest have been turned black by pollution.