Briana notices the electrons that the water molecules release. She asks, "Will the electrons build up in the chloroplast?" Which addition to the diagram would be most useful for answering Briana's question?

A. a wavy arrow that shows Photosystem I
B. an equation for the chemical reaction that forms water from hydrogen ions, electrons, and oxygen molecules
C. an arrow that shows the electrons moving through electron carriers, and received by NADP+
D. an equation for the chemical reaction that forms hydrogen gas from hydrogen ions and electrons