Apple Assigns the Same Contract Rights to Enzo,and Then to Sam.Sam

Multiple Choice

Apple assigns the same contract rights to Enzo,and then to Sam.Sam immediately notifies the obligor of the assignment to him;Enzo never notifies the obligor.When Sam notified the obligor,he did not know about the earlier assignment to Enzo.Sam will have the better right under the:

A) "American rule."
B) "English rule."
C) Restatement (Second) of Contracts.
D) common law.