Which of the Following Is the Likely Result If Sam

Which of the following is the likely result if Sam sues Betty for the $40 that Trudy owes him for the book?

A) Sam will lose because the attempted delegation was against public policy.
B) Sam will lose because his only right of action is against Trudy.
C) Sam will lose because he was not aware of the assignment before the duties were completed.
D) Sam will win only if he can prove that Trudy has insufficient funds with which to pay him.
E) Sam will win.