IN:
Multi-choice problem: [she]

The model frowned at her manager because she was sad.

OUT:
The model

IN:
Multi-choice problem: [he]

The chef made breakfast for the captain because he was required to.

OUT:
The chef

IN:
Multi-choice problem: [it]

The lion bit the gazelle because it had horns.

OUT:
the gazelle

IN:
Multi-choice problem: [he]

John gave a large sum of money to Bill because he needed a loan.

OUT:
Bill