Problem: How does the sentence end?

Hunter wanted fish as pets, but Robert disagreed. 
OPTIONS:
- Hunter didn't mind having to clean the aquarium.
- Robert didn't mind having to clean the aquarium.
Answer: Hunter didn't mind having to clean the aquarium.

Problem: How does the sentence end?

Laura managed to survive a serious illness which Samantha did not survive because 
OPTIONS:
- Laura shunned available medicine.
- Samantha shunned available medicine.
Answer: Samantha shunned available medicine.

Problem: How does the sentence end?

Kevin worried about some hidden meanings when he received a compliment from Robert, but 
OPTIONS:
- Kevin looked genuine.
- Robert looked genuine.
Answer: Robert looked genuine.

Problem: How does the sentence end?

Katia prefers posting her personal messages on Twitter to Facebook because the 
OPTIONS:
- Facebook is much more private.
- Twitter is much more private.
Answer:
Twitter is much more private.