Which of the Following Is a True Statement About the Rights

Which of the following is a true statement about the rights of an assignee of contract rights?

A) The assignee must have received all of the assignor's rights, because partial assignments are not permissible.
B) The assignee often gets greater ability to enforce a right than the assignor had.
C) The assignee obtains the assignor's rights only if the obligor consents.
D) The assignee's rights are no greater than those of the assignor.
E) The assignee has rights, but must have the assignor institute any lawsuit needed to compel performance.