Which One of the Following Assignments Would Probably Be Prohibited

Multiple Choice

Which one of the following assignments would probably be prohibited by a court?

A) Mary is in debt. A credit card company calls and threatens to sue. Mary orally assigns her next bimonthly paycheck to her creditor.
B) John is a house painter. He is scheduled to paint Molly's home on Monday. John wakes up Monday morning with a stiff neck. He calls Ed, who is also a painter, to begin the job at Molly's.
C) Ron has a contract with Bonett Bank to service their coffee machines. He assigns the remainder of his contract with Bonett to Michelle, who also owns a coffee service.
D) All of these.