Why Are Chloroplasts Essential to the Survival of Many Animals

Why are chloroplasts essential to the survival of many animals as well as plants?

A) Photosynthesis generates protein building blocks essential to animal functioning that cannot be acquired by animals in any other way.
B) Animals do not have chloroplasts and must depend on organisms that can photosynthesize the energy they need.
C) Chloroplasts allow both animals and plants to break down organic molecules and use the energy stored in the molecules.
D) Many animals can only produce their own energy after they have consumed sufficient photosynthetic chloroplasts.
E) Chloroplasts are rich in fats and lipids that are generated by photosynthesis satisfying the energy requirements of many animals.