Why Do Heterotrophs Require "Food" for Survival

Multiple Choice

Why do heterotrophs require "food" for survival?

A) Food provides the organic chemicals needed by heterotrophs.
B) Food is an alternative source of energy for heterotrophs when sunlight is unavailable.
C) Heterotrophs cannot photosynthesize without the chemicals provided by food.
D) Food provides at least half of the water required by heterotrophs.