As we know the process of photosynthesis mainly occurs in plant cells, so we can differentiate between animal and plant cells to see which organelles exist in plant cells, but NOT in animal cells.
The organelles which form that part of the set are
Cell Wall
Chloroplasts
The answer is most definitely chloroplasts as they are the organelles that contain the green pigment chlorophyll which traps sunlight - the energy required to carry out photosynthesis.
