An assignor who assigns the same right to different people will be held liable to the assignee who acquires no rights against the obligor, but which assignee is entitled to the obligor's performance?

A. Under the American Rule, the assignee who first gives notice of the assignment to the obligor, without knowledge of the other assignee's claim has a better right.

B. Under the English Rule, the assignee who first gives notice of the assignment to the obligor, without knowledge of the other assignee's claim, has the better right.

C. Under the English Rule, the first assignee will always have the better right.

D. None of the above