Interactions Between Sea Anemones and Anemonefish Were Once Described as an Example

Interactions between sea anemones and anemonefish were once described as an example of commensalism, but more recently some scientists hypothesize that they might be mutualism.Which behavioral interaction, if correct, would best justify this change in description?

A) The anemone provides the fish with food but receives no benefit from the fish.
B) The anemone protects the fish from predators but receives no benefit from the fish.
C) The anemone stings most fish but ignores the anemonefish, which has a mucous coat.
D) The anemone receives nutrients from the fish's feces, and the fish scavenges food from the anemone.
E) The anemone protects the anemonefish and provides it with food; the fish in turn steals the anemone's prey.