The water-splitting step of photosynthesis that releases oxygen is called

Explanation

The correct answer is B: photolysis. During the light-dependent reactions of photosynthesis, photolysis refers to the splitting of water molecules into oxygen, protons, and electrons using light energy. This process occurs in the thylakoid membranes of chloroplasts and is crucial for providing electrons to the photosynthetic electron transport chain. Options A, C, and D are incorrect because they refer to molecules involved in electron transfer, but not in the process of water splitting that releases oxygen.