Question 6 1 pts To be relieved of his/her duties under a contract because of mental incompetence, most states use the objective cognitive understanding test which states: some disturbance of the mind. incapacity to make a rational decision. the person's mental incapacity must render that person incapable of understanding or comprehending the nature of the transaction. O an illness or defect that impairs the party's ability to transact in a reasonable manner