Which of the Following Occurs During Cyclic Electron Flow?
A) $\rarr$

Which of the following occurs during cyclic electron flow?

A) photosystem I absorbs light but not photosystem II
B) protons are pumped into the lumen by cytochrome b₆f
C) electrons are transferred from photosystem I $\rarr$ ferredoxin $\rarr$ cytochrome b₆f $\rarr$ plastocyanin, then back to photosystem I
D) there is no production of NADPH or oxygen
E) all of the above