Why Do Most Cells in the Body Require Oxygen Molecules

Why do most cells in the body require oxygen molecules?

A) Glucose cannot be broken down without it.
B) It pulls electrons off the electron transport chains in the last part of cellular respiration.
C) The electron transport system must pump it through the inner membrane for chemiosmosis.
D) ATP synthase uses it to add a phosphate ion to ADP in order to make ATP.
E) It pulls electrons off the electron transport chains in the last part of cellular respiration and ATP synthase uses it to add a phosphate ion to ADP in order to make ATP.