Which of Thfollowing Statements Is CORRECT About Electron Transfers

Which of thfollowing statements is CORRECT about electron transfers?

A) Coenzymes are sometimes involved in electron transfer.
B) Electrons accepted by electron carriers are passed to the electron transfer chain.
C) Proteins involved in an electron transfer chain are membrane-bound proteins.
D) Electrons entering an electron transfer chain are always at a higher energy level.
E) All of these are correct.