Which sentence uses capitalization correctly?

A. I think my Aunt should consider calling ahead to see if we can get a reservation.

B. My High School has been taking a field trip to a farm outside of Iowa City for years.

C. I asked my neighbor if She would pick up my mail while I am out of town.

D. The detective said, “If you see or hear anything, please don’t hesitate to call me.”

The answer to this question is D. I saw this question elsewhere but I was not able to answer it because two people had already answered it. They were both wrong.