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The question that can be answered about the light-dependent reactions is:
**d. Where is water broken down?**
During the light-dependent reactions of photosynthesis, water is split (a process known as photolysis) to provide electrons and protons, and oxygen is released as a byproduct. The other options pertain to processes that occur in the Calvin Cycle or other stages of photosynthesis, not specifically in the light-dependent reactions.