Flowers,like the Ones in the Figures Below,display Spectacular Colors,shapes,and Odors

Flowers,like the ones in the figures below,display spectacular colors,shapes,and odors in combination with food rewards,such as nectar,in order to convince pollinating animals to visit several flowers of the same species to transfer pollen for reproduction.

How might a flower be specialized to attract hummingbird pollinators (above right) and discourage insect pollinators (above left) ?

A) have brightly colored petals
B) open only at night
C) hang downward from the branch tips
D) organize its flowers into a flat landing surface