If Carol,acting as Agent for Steve,signs a Contract,she Alone Will

Multiple Choice

If Carol,acting as agent for Steve,signs a contract,she alone will be personally bound by it:

A) if Steve's name or the fact that Carol is an agent is never mentioned and Steve does not carry out the contract.
B) never;as an agent she is only a representative.
C) if she decides to sue.
D) if Steve is discovered by the third party to be the principal and the third party elects to hold him liable for performance.