The correct option is: (a) thylakoids
Explanation:
Thylakoid are structural elements of chloroplasts. They are membrane lined flattened sacs. Photosynthetic pigments are located in the membranes of thylakoids in specific areas called quantasomes. Photosynthetic pigments of higher plants include chlorophyll a, chlorophyll b, carotenes and xanthophylls.
