In the process of noncyclic photophosphorylation A. water is split to form oxygen gas. B. electrons from water flow through electron transport chains resulting in synthesis of ATP and NADPH. C. photosystems I and II are both required. D. All of the choices are correct.

Explanation:

In a process called non-cyclic photophosphorylation ( light-dependent reactions), electrons are removed from water and passed by different electron carries like Pq, Pc and cytochrome complex and many others, through PSII and PSI before ending up in NADPH.

These are the basic steps of  non-cyclic photophosphorylation:

i)Light absorption in PSII (P680)

ii) ATP synthesis.

iii)Light absorption in PSI (P700)

iv) NADPH formation.