PT 59 S3 Q22

Since anyone who makes an agreement has anobligation to fulfill the terms ... ...

Which one of the following statements most accurately characterizes the argument's reasoning flaws?
(A) The argument fails to make a crucial distinction between an action one is legally obligated to perform and an action with good consequences, and it takes for granted that everything true of legal obligations is true of obligations generally.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-B, Dec. '09 LSAT (PT 59 Sec. 3)