The hippo ate the food the trainer brought when he put it in the trough.

Who is "he" in this prior sentence?
OPTIONS:
- The hippo
- the trainer
the trainer
The police arrested the rioters because they were preventing trouble.

Who is "they" in this prior sentence?
OPTIONS:
- The police
- the rioters
The police
The hammer hit the bullet, so it shot.

Who is "it" in this prior sentence?
OPTIONS:
- The hammer
- the bullet
the bullet