18. The electron acceptors associated with photosystem II use the energized electrons to pump H ions from the stroma into the thylakoid space. This creates a high concentration of H ion inside the thylakoid. As the H ions diffuse through ATP synthase back to the stroma, their energy is used to make ATP. What is the name of this kind of ATP producing process?
A) Electron Transport ---- B) ATP Synthesis ---- C) Chemiosmosis ---- D) Substrate-level Phosphorylation