It won't allow me to add the diagram, says it's too big. But here is the gist:

BILL OF MATERIALS 1..*-----------------------------------------1..1 MATERIALS

Refer to the association marked with the number 2 in the preceding diagram. Which of the following is the best description of the association?

A. None of these is a description of the association.

B. A raw material item could be related to no bill of materials.

C. Each raw material is related to one bill of material.

D. Each raw material is related to a maximum of one bill of materials.

E. A raw material item could be related to multiple bills of materials.