Sid and Nancy Entered into a Contract

Sid and Nancy entered into a contract. Part of that contract was subsequently assigned to Johnny. Which of the following statements may be TRUE?

A) The assignment must have happened by operation of law, rather than in response to a party's intention.
B) Johnny may be able to collect the same debt twice if the debtor does not provide timely notice of the assignment.
C) As a result of a statutory assignment, Johnny became entitled to receive half of the money that Nancy owed to Sid under the contract.
D) Johnny is now required to provide personal services to either Sid or Nancy.
E) One of the parties assigned the contract to Johnny even though the other party strenuously objected to that development.