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The correct response is:
**two electrons and a hydrogen ion.**
In the process of Photosystem I, NADP+ is reduced to NADPH, which requires two electrons and one hydrogen ion (H⁺) to complete the reduction process. The overall reaction can be summarized as:
\[ \text{NADP}^+ + 2e^- + H^+ \rightarrow \text{NADPH} \]
This indicates that two electrons and one hydrogen ion are involved in the formation of NADPH from NADP+.