The correct option is C Quantasome
The protein-rich fluid within the inner chloroplast membrane and outside of the thylakoid space is called the stroma and contain chloroplast DNA, ribosomes, the thylakoid system and starch granules.
Stacks of thylakoids are refered to as grana.
Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place.They are composed of lipids and proteins, which include various photosynthetic pigments and redox carriers. For this reason they are considered to be the site of photochemical reactions.
Within the chloroplasts, individual granum units are connected via the stroma lamellae.