Correct Option: A

Internally a chloroplast contains a matrix or stroma which is similar to cytoplasm in its constitution. It contains DNA, RNA, ribsomes, enzymes for CO₂ assimilation, proteins, starch grains and fat droplets or plastoglobuli.
In the matrix or stroma are embedded a number of flattened membranous sacs called thylakoids or lamellae. At places the thylakoids are aggregated to form stacks called grana.