I deposited her at the girls’ dormitory, where she assured me that she had had a perfectly terrific evening, and I went glumly to my room.
句意：我把她送到了女生宿舍，在那里她向我保证说这个晚上她过得非常痛快。我闷闷不乐地回到了我的房间。deposit此处指“送回”。D选项与划线处意义最为接近，故选D。