Which of the Following Would Not Be Considered an Example

Which of the following would not be considered an example of a prezygotic reproductive isolating mechanism?

A) One bird species forages in the tops of trees for flying insects, whereas another forages on the ground for worms and grubs.
B) The males of one species of moth cannot detect and respond to the sex attractant chemicals produced by the females of another species.
C) Sperm of one species of sea urchin are unable to penetrate the egg plasma membrane of another species.
D) Mosquitoes of one species are active in foraging and searching for mates at dusk, whereas those of another species are active at dawn.
E) Flowers of one orchid species mimic female bees of species A, whereas flowers of another orchid species mimic female bees of species B.