Oliver, a marketing manager, has created this visual to go with a business proposal. The proposal recommends discontinuing production of one of the company’s three products because it isn’t performing well. Which statement describes a change that would improve Oliver’s presentation?

A.
He should use a single color to represent all three products in the line graph.
B.
He should add text below the graphic to give extra information about the products.
C.
He should add a legend to indicate which line represents which product.
D.
He should delete the source cited at the bottom because it is irrelevant.