QUES:
Who is he in the following sentence?

The youth outran the old man because he was in shape.

ANS:
The youth

QUES:
Who is they in the following sentence?

Iphones are selling more than androids because they are hard to use.

ANS:
androids

QUES:
Who is they in the following sentence?

The heavy weapons team bombarded the settlement with their mortars since they needed to soften up the enemy before moving in.

ANS:
The heavy weapons team