Marshall would like feedback on what coworkers really think of him. He is best advised to get input from a ________.

A) Johari Window
B) performance evaluation from his superior
C) self-assessment quiz
D) system of peer evaluations

A system of peer evaluations would allow Marshall to receive feedback from coworkers, giving him insight into how he is perceived by others in the workplace. This type of feedback is more direct and candid than a performance evaluation from a superior or a self-assessment quiz. The Johari Window may also be useful, but requires a more extensive process of self-disclosure and feedback from others, which may not be necessary in this case.