Bok buys an espresso machine from Coffee Gadgets, which bills him for $100. He writes out a check drawn on Dios Bank, but later, believing that the machine is defective, issues a stop-payment order. Dios:. a. is liable to Coffee Gadgets for the amount of the check.
b. need not follow Bok’s order because it was issued after the check.
c. need not follow Bok’s order unless the check was certified.
d. must stop payment if the bank has a reasonable time to act.

d. must stop payment if the bank has a reasonable time to act.

Explanation:

Dios as a bank holds money for it's customers which means that the money is still under the ownership of the customer in question to do as they see fit.

If the customer therefore instructs them to act in a certain way with that money, they will do so provided that it is legal of course.

Bok asks Dios to stop a payment related to his own money and so they must do so if they have enough/reasonable time to do so because as their customer, he is there first priority especially in relation to his own money.