Flowers, Like the Ones in This Figure, Display Spectacular Colors

Flowers, like the ones in this figure, display spectacular colors, shapes, and odors, in combination with food rewards such as nectar, to convince pollinating animals to visit several flowers of the same species and transfer pollen for reproduction. How might a flower be specialized to attract hummingbird pollinators (right) and discourage insect pollinators (left) ?

A) by having brightly colored petals
B) by producing sugary nectar
C) by hanging downward from the branch tips
D) by organizing its petals into a flat landing surface