Final answer:
Septal tissue (C) divides the internal sections of an earthworm, distinguishing it from other tissues like epithelial, nervous, and connective tissues.
Step-by-step explanation:
The tissue that internally divides each section of the earthworm is known as septal tissue (C). Septal tissue consists of thin partitions that segment the earthworm's body into a series of compartments or segments. This is distinct from the other types of tissues mentioned, such as epithelial tissue which covers surfaces of the body, nervous tissue which transmits nerve impulses, and connective tissue which binds and supports body structures.