Step 1: Quantasomes are functional units of photosynthesis located on the thylakoid membranes of chloroplasts.
Step 2: Each quantasome consists of a group of chlorophyll molecules along with accessory pigments and proteins.
Step 3: A quantasome contains approximately 250 chlorophyll molecules, which work together to capture light energy efficiently.
Therefore, the correct answer is 250 chlorophyll molecules.