The correct option is C True coelom
The coelom of an earthworm is its body cavity. It has a true coelom. There are three categories for grouping animals according to their coeloms, coelomate (animals that have a true coelom lined by muscle tissue on both sides), pseudocoelomate (animals that have a coelom line by muscle tissue only on one side), and acoelomates (animals that do not have a body cavity lined by muscle tissue on either side). Earthworms are coelomate animals.