Mutualism Is a Relationship

Mutualism is a relationship

A) where it is difficult to prove the benefits or disadvantages one member of the relationship may provide for the other.
B) where only one member derives benefit from the other.
C) where one member of the relationship may kill the other.
D) where one member of the relationship benefits without hurting the other.
E) that sometimes provides benefits for both members such that one or both parties cannot live without the other.