Ella owed Mark $500. Since Ella didn't have the money to pay Mark, she asked Mark if he would accept a negotiable instrument, such as a promissory note, as payment for the debt. Mark indicated he would accept a negotiable instrument as payment. Ella wrote out a promissory note in which she agreed to pay Mark $550 in 60 days if she failed to pay him the $500 in cash within the next 30 days. Ella's promissory note isn't negotiable because negotiable instruments must

A. state a fixed amount of money.

B. be payable at a definite time.

C. give an unconditional promise or order to pay.

D. be payable to order or to bearer.