Correct option is D
The correct answer is option (d).
The passage clearly states that algae are photosynthetic creatures that contain pigments such as
chlorophyll, which is the
principal pigment that enables them to perform photosynthesis.
Other options are incorrect because:
•
(a) Carotenoid – These are accessory pigments, not the main pigment mentioned in the passage.
•
(b) Melanin – This pigment is related to skin/hair coloration in animals and not involved in photosynthesis.
•
(c) Xanthophyll – Another accessory pigment in photosynthesis but not the principal pigment.