QUES:
Who is she in the following sentence?

Jerrica saw the guard as she marched past.

ANS:
the guard

QUES:
Who is he in the following sentence?

John appreciated Bill because he had been in need.

ANS:
John

QUES:
Who is he in the following sentence?

Alex Rodriguez is paid much higher than Brandon Hughs because he is grossly overpaid.

ANS:
Alex Rodriguez