The correct answer is C. chloroplast.
Extra information:
Clorophyll and chloroplasts are only found in plants. Seeing as photosynthesis can only occur in plants (a few exeptions can be made, but in general only plants can do photosynthesis), the chlorophyll is found in chloroplasts. Ribosomes, (parts of) the nucleus and the endoplasmatic reticulum are important for the production of proteins, but that (almost) only occurs in animals (and humans) and not in plants.
