Seth Grants Express Authority to Reba to Enter Contracts on His

Seth grants express authority to Reba to enter contracts on his behalf.If Reba discloses to third parties that she is an agent for Seth,she has liability on a contract in all but which of the following situations?

A) Reba makes a contract in her own name.
B) Reba makes a contract within the scope of her authority and discloses that she is acting for Seth.
C) Reba co-makes a contract with Seth.
D) Reba guarantees that Seth will perform the contract.
E) Reba cannot be held liable on a contract when she discloses she is Seth's agent as long as the contract is within her scope of authority.