In Bacterial Photosynthesis, How Would the Light Energy Be Used

Multiple Choice

In bacterial photosynthesis, how would the light energy be used if the reduced bacteriopheophytin (BPh ^- ) returned the electron to the P960⁺ cytochrome?

A) It would follow a separate electron-transport chain.
B) It would be lost as heat.
C) It would stimulate the ejection of a second electron.
D) A proton would be pumped.
E) None of the answers is correct.