Photosystem II occurs in

Answer: Option C

Photosystem II occurs in Grana.
Photosystem II is the first protein complex in the light-dependent reactions of oxygenic photosynthesis. It is located in the grana of thylakoid membrane of plants, algae, and cyanobacteria.
The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen.
Photosystem II (of cyanobacteria and green plants) is composed of around 20 subunits (depending on the organism) as well as another accessory, light-harvesting proteins.