Examine the Illustration Below

Examine the illustration below. Which statement best summarizes the contribution of Photosystem I (PSI) during photosynthesis?

A) PSI provides the initial energy boost to the electrons on their way to Photosystem II (PSII) .
B) PSI generates the excited electrons that initially accumulate within the thylakoid space and eventually drive ATP synthesis.
C) PSI generates the high-energy electrons that are transported by NADPH to the Calvin cycle and will eventually reduce the carbon in CO₂.
D) PSI regulates the transmembrane passage of protons through the thylakoid membrane.