Which of the Following Oral Contracts May Be Enforceable

Which of the following oral contracts may be enforceable?

A) Nathan owes $1,000 in back rent to his landlord.Miranda tells Nathan not to worry about it,she'll pay his debt for him.
B) Kenny orally agrees to purchase 5,000 pencils that the ABC Pencil Company stamps with the words "Kenny is the Greatest!"
C) Mrs.Washington calls the corner grocery and places an order for a loaf of bread,a gallon of milk,and a pound of hamburger to be delivered to her.Ten minutes later,before the store has a chance to put together her items,she calls to cancel the order.
D) All of these are correct.