当血管升压素和醛固酮分泌增多时，以下叙述正确的是（）。

A.水、钠和钾的排出量均增加

B.水、钠和钾的排出量均减少

C.水和钠排出量减少，钾排出量增加

D.水和钾排出量减少，钠排出量增加

E.水排出量增加，钠和钾排出量均减少

By serving others, a person focuses on someone other than himself or herself, _____ can be very eye-opening and rewarding.[ ]

A. who            

B. which              

C. what              

D. that