The correct option is
C All of the above
Workers are sterile, wingless and blind males and females. Their cuticle is unpigmented and not hardened, therefore the animals are confined to a dark and moist environment. Workers build the nest and galleries, they fetch food, care for the brood and feed reproductives and soldiers. Soldier termites are both male and female. They are sterile, wingless, and blind termites. Their role in the colony is to defend the colony from unwanted intruders by using their powerful jaws.
Hence, the correct answer is (D)