QUES:
Who is they in the following sentence?

The children played games because they were bored.

ANS:
The children

QUES:
Who is he in the following sentence?

Bill triumphed over John in the boxing ring because he fought cowardly.

ANS:
John

QUES:
Who is she in the following sentence?

The mother encouraged her daughter to sing a difficult song so she would be challenged.

ANS:
her daughter