How do accessory pigments like chlorophyll b and carotenoids complement chlorophyll a in photosynthesis?

• A. They replace chlorophyll a in absorbing light.
• B. They absorb the same wavelengths as chlorophyll a.
• C. They are only used in low-light conditions.
• D. They broaden the range of light wavelengths that can be absorbed.

Answer: (D)