Which statement describes the functioning of photosystem II?A. The P680 chlorophyll donates a pair of protons to NADPH, which is thus converted to NADP+. B. The electron vacancies in P680 are filled by electrons derived from water. C. The excitation is passed along to a molecule of P700 chlorophyll in the photosynthetic unit. D. Light energy excites electrons in the electron transport chain in a photosynthetic unit. E. The splitting of water yields molecular carbon dioxide as a by-product.

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