Problem: How does the sentence end?

Logan was an inferior card player to Donald because 
OPTIONS:
- Logan had a good poker face.
- Donald had a good poker face.
Answer: Donald had a good poker face.

Problem: How does the sentence end?

Logan was more prone to illness than Donald because 
OPTIONS:
- Logan had a strong immune system.
- Donald had a strong immune system.
Answer: Donald had a strong immune system.

Problem: How does the sentence end?

Samantha has an affinity for salt while Katrina does not, so 
OPTIONS:
- Samantha likes licking the top of the martini glasses.
- Katrina likes licking the top of the martini glasses.
Answer: Samantha likes licking the top of the martini glasses.

Problem: How does the sentence end?

Cynthia didn't know anything about physics but Laura did because 
OPTIONS:
- Cynthia was smarter at science.
- Laura was smarter at science.
Answer:
Laura was smarter at science.