Which event occurs in photosystem I? A. Water molecules are broken apart B. Light energy excites electrons C. Oxygen is released as waste D. Electrons are transferred to ferredoxin

I think the correct answer from the choices listed above is option D. The event that happens in photosystem I is that electrons are transferred to ferredoxin. This is a part of photosynthetic light reactions which makes use of light energy to transfer electrons from plastocyanin to ferredoxin.