QUES:
Who is they in the following sentence?

DVD Players are slowly being replaced by Blu Ray Systems, but they will still exist for years to come.

ANS:
DVD Players

QUES:
Who is she in the following sentence?

Pat tried to talk to Jill but she was ignored.

ANS:
Pat

QUES:
Who is he in the following sentence?

Cartman finally decided to get rid of his stuffed animal, Clyde Frog, because he was told by his friends to grow up.

ANS:
Cartman