In the Coral Reef Environment, the Ivory Bush Coral Competes

In the coral reef environment, the ivory bush coral competes for space with surrounding seaweed.The red-ridged clinging crab feeds on seaweed but is also preyed on by surrounding fish.The crab hides in the coral branches and feeds only on the seaweed closest to the coral.Would the crab-coral interaction be best classified as mutualism or commensalism?

A) Commensalism, because the crab receives protection and the coral is unaffected
B) Commensalism, because the crab has less competition and the coral is unaffected
C) Commensalism, because the crab is unaffected and the coral has less competition
D) Mutualism, because both the crab and the coral receive more food from the interaction
E) Mutualism, because the crab receives protection and the coral has less competition from seaweed