The Following Questions Refer to the Description Below

The following questions refer to the description below.
Biologists are studying pollination of one species of alpine flower in the Canadian Rocky Mountains. In late spring and early summer, they find that the majority of flowers are deep red and deep pink. Toward the end of summer, the most common colours are white and very pale pink.
-In order to complete their pollination study, the biologists had to

A) identify the early-season pollinator and count their numbers, and count the number of deep red/pink flowers.
B) identify the late-season pollinator and count their numbers, and count the number of light pink and white flowers.
C) identify the early-season pollinator and the late-season pollinator.
D) cut down either the dark or light flowers and see which pollinators returned.
E) A and B