What process provides the electron transport chain with the energy it needs to function

The electrons are created in the Kreb's Cycle and are transferred in NADH and FADH2 to be used in the electron transport chain.

Redox reactions. The electron transport chain (ETC) is a series of compounds that transfer electrons from electron donors to electron acceptors via redox reactions, and couples this electron transfer with the transfer of protons (H+ ions) across a membrane.

The answer is a i believe