The Primary Function of the Electron Transport Chain and Oxidative

The primary function of the electron transport chain and oxidative phosphorylation is which of the following?

A) to provide electrons and energy for the phosphorylation of ATP
B) to synthesize the reduced coenzymes necessary for digestion
C) to oxidize the reduced coenzymes NADH and FADH₂, and provide energy for the synthesis of ATP
D) to transport electrons from ATP to ADP, and synthesize acetyl CoA molecules