Which of the following statements is true regarding the larval stage of a fly?

The larval stage of a fly is indeed called a maggot, which is a term used to describe the immature form of flies, particularly of the order Diptera. Maggots are typically whitish, soft-bodied larvae that emerge from eggs laid by adult flies. This larvae stage is crucial for the development of flies as they primarily focus on feeding and growth.

In contrast to other options, maggots are known for their feeding habits, as they consume decomposing organic matter or other food sources during this stage, which is essential for their development. They thrive in various environments, not necessarily clean ones; in fact, many species prefer decaying or rotting materials. Additionally, while some aquatic larvae of different insect groups exist, maggots generally do not reproduce in water and are typically found in moist environments with abundant organic matter.

Thus, the correct answer encapsulates the biological nomenclature and common characteristics of the larval stage in flies, emphasizing the importance of maggots in the fly life cycle.