The correct option is A Grana
Chloroplasts, a eukaryotic plant cell organelle, is an essential structure in the manufacture of food through photosynthesis.
Chlorophyll is a specialised light absorbing pigment that is found in chloroplasts.
This pigment is found in the inner walls of the grana of chloroplasts.
Stacks of sac like membrane-bound structures called thylakoids is known as grana and is the location for the light reaction of photosynthesis.