The best response to the given situation is letter a, Rocco may select someone to sign on his behalf. In all of the choices above, this is the best choice to the scenario because in signing a contract, it is best that the individual who is in critical condition or in a state that he or she wouldn't be able to sign, the person should chose someone who could be in his or her behalf in which it is someone whom that person trust and could be able to be a representation in his or her behalf.