The Energy in Organic Molecules Is Released in a Series

The energy in organic molecules is released in a series of steps because:

A) it is not possible to release it in a single step.
B) more total energy is released in multiple steps than would be released in a single step.
C) less total energy is released in multiple steps than would be released in a single step.
D) more energy can be harvested for cellular use in multiple steps than from a single step.
E) only a single electron can be moved at a time in a cellular reaction.