Answer:
Option D, Hydrogen ions flow down a concentration gradient from the thylakoid space to the stroma through ATP synthase, releasing energy that can be used to produce ATP from ADP + Pi.
Explanation:
The hydrogen ion released during the breaking of water molecule starts building in the thylakoid space. This causes a difference in concentration across the membrane due to difference in build proton concentration and the charges created across the membrane. Ā
Potential energy obtained from this set up is collected and stored as chemical energy in ATP through the assistance of enzyme ATP synthase
Option D is correct