Examine the Illustration Below

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

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