Correct!

The electron transport chain is located predominantly in the:

A. Outer membrane of the mitochondria

B. Intermembrane space of the mitochondria

C. Inner membrane of the mitochondria

The inner membrane of mitochondria contains the proteins of the electron transport chain, and is the barrier allowing the formation of a H+ gradient for ATP production through ATP synthetase.

D. Matrix of the mitochondria

E. Cytoplasm of the cell