Final answer:
The site of the photosystems in the light-dependent reactions of photosynthesis is the thylakoid membrane within the chloroplasts of plant cells.
Step-by-step explanation:
The site of the photosystems in the light-dependent reactions of photosynthesis is b. thylakoid membrane. The thylakoid membrane is found within the chloroplasts of plant cells and is the location where photosystems I and II are located. These photosystems contain the pigments that capture light energy and initiate the process of photosynthesis by converting light energy into chemical energy.
Learn more about Photosystems in photosynthesis