Use the image to answer the question. An illustration shows a parallelogram with the left side labeled upper C and the right side labeled upper D. A dotted line, labeled upper B, runs from the top left vertex to the bottom right vertex. The base is extended to the right by a second dotted line. A dashed line, labeled upper A, runs from the top left vertex to the base, meeting the dotted base line. The three dotted lines form a triangle.

Which dimension can be used in an equation that models finding the area of the parallelogram?

C.
C.

D.
D.

A.
A.

B.