QUES:
Who is they in the following sentence?

The Backstreet Boys were much more popular than N-Sync since they had the better music.

ANS:
The Backstreet Boys

QUES:
Who is he in the following sentence?

Mark tackled the quarterback, but he managed to complete the pass.

ANS:
the quarterback

QUES:
Who is they in the following sentence?

Battlefield 3 is garnering more attention than Modern Warfare because they have graphics that are on a whole new level.

ANS:
Battlefield 3