Jack wrote this expression to describe how much he will pay for flowers.

5 × f

Which situation could be described by this expression?

A.
Jack knows that he will buy 5 blue flowers. He does not know how many yellow flowers he will buy.

B.
Jack knows that each flower costs $5. He knows that he will buy 5 flowers.

C.
Jack knows that the flowers cost a total of $5. He does not know how many flowers he will get.

D.
Jack knows he will buy 5 flowers. He does not know how much each flower costs.