Consider the following events of photosynthesis.1. Light energy excites electrons.2. Water molecules are split.3. NADPH is formed.In which locations do each of these events occur?

Water is split at photosystem II, replacing electrons lost when light excites its electrons. The electrons then move through the electron transport chain to photosystem I, where light excites them again; they ultimately help form NADPH. Thus the sequence is photosystem II, photosystem II, and photosystem I, which is choice B.

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