Ecologists Often Build Models to Depict the Relationships Between Organisms

Ecologists often build models to depict the relationships between organisms.In such models,an arrow is used to link two organisms in a relationship.The arrowhead is next to the organism that is affected.If the effect is positive,the arrow is labeled with (+) ,and if negative,the label is (-) .
-Which of the following models best illustrates the relationship of the Brazil nut tree and the other organisms associated with it?

A)

B)

C)

D)