Answer: b. the thylakoids
Step-by-step explanation:
Chlorophylls are located in chloroplasts, which organelle is the continent of photosynthesis, ie, where the two important reactions occur: photochemistry, on the thylakoid membranes and biochemistry, in the chloroplast stroma.
The pigments involved in photosynthesis are chlorophylls a and b, carotenoids and phycobilins. Chlorophyll b, carotenoids, and phycobilins constitute the so-called accessory pigments. The energy absorbed by the pigments is transferred to well-defined sites located on the thylakoids membranes, the so-called reaction centers.