Greg owes Timothy $1,000 and gives him a check to repay the amount. When Timothy presents it at Greg's bank five months later, however, the bank refuses to pay the check

The bank was willing to act in good faith, but is not liable for the dishonor of the check. Which of the following, if true, would explain the dishonor of the check by Greg's bank?
A) Timothy filled in his name as the payee on the check as Greg had forgotten to do so.
B) Greg had not filled in the amount, so Timothy duly wrote $1,000 on the check before he presented it to the bank.
C) Greg had issued a stop-payment order on the check immediately after giving it to Timothy.
D) Greg had postdated the check four months from the date of giving the check to Timothy.

C