One can never tell whether another person is acting from an ulterior motive; ttherefore, it is impossible to tell whether someone' s action is moral, and so one should evaluate the consequences of an action rather than its morality. Which one of the following principles, if valid, most helps to justify the reasoning above? ['The assigning of praise and blame is what is most important in the assessment of the value of human actions.', 'There can be good actions that are not performed by a good person.', 'The intention of an action is indispensable for an evaluation of its morality.', "One can sometimes know one's own motives for a particular action."]