Which caste member feeds subterranean soldier termites?

The correct choice indicates that worker termites are responsible for feeding subterranean soldier termites. This role is essential within the termite colony's social structure. Workers are the non-reproductive caste and perform various tasks that support the colony's overall function, including foraging for food, tending to the queen, and taking care of the soldiers and nymphs.

Subterranean soldier termites, on the other hand, primarily serve a protective role, defending the colony against predators. They do not forage for food themselves but rely entirely on workers to provide them with nourishment. As such, the workers not only supply food to the soldiers but also ensure that the entire colony remains well-fed and healthy.

This interdependence is crucial for the survival of the colony, illustrating the cooperative behavior characteristic of termite societies. Consequently, the responsibility of feeding soldiers falls to the worker caste, reinforcing their vital role in maintaining the colony's structure and function.