One of your classmates, Maria, is a hardworking student, serious about her classes, and conscientious about her grades. Maria also devotes a considerable amount of time to help her classmate John with his game theory assignments. Is Maria displaying rational behavior?

(A) Yes, she is devoting some of her time to the benefit and well-being of others even if her grades suffer.
(B) Yes, if helping her classmate gives her utility.
(C) No, since rational individuals maximize payoffs.
(D) No, all of her time should be spent studying.