Problem: How does the sentence end?

Rachel gave a reward to Monica for doing a great job on the account, since 
OPTIONS:
- Rachel was a good boss.
- Monica was a good boss.
Answer: Rachel was a good boss.

Problem: How does the sentence end?

Robert has many tattoos on his body, while Aaron has none, because 
OPTIONS:
- Robert is an atheist.
- Aaron is an atheist.
Answer: Robert is an atheist.

Problem: How does the sentence end?

Justin attended all of the wild parties without Brett, because 
OPTIONS:
- Justin wanted to be a homebody.
- Brett wanted to be a homebody.
Answer: Brett wanted to be a homebody.

Problem: How does the sentence end?

Katrina taught Lindsey how to pick up girls because 
OPTIONS:
- Katrina was quite skilled at it.
- Lindsey was quite skilled at it.
Answer:
Katrina was quite skilled at it.