A lichen is a combination of fungus and algae that lives on the sides of trees, rocks, and other materials. The fungus provides the algae with water and minerals and the algae uses the water and minerals to make food for both organisms. What ecological relationship does the lichen represent?

A. Mutualism because the fungus benefits from the relationship while the algae is unaffected.

B. Commensalism because the fungus and the algae are both benefit from the relationship.

C. Mutualism because the fungus and the algae are both benefit from the relationship.

D. Commensalism because the fungus benefits from the relationship while the algae is unaffected.