Problem: How does the sentence end?

Christine followed a carnivorous diet but Tanya followed a vegetarian diet. 
OPTIONS:
- Christine ordered the grilled portabella for their supper.
- Tanya ordered the grilled portabella for their supper.
Answer: Tanya ordered the grilled portabella for their supper.

Problem: How does the sentence end?

Katrina asked Natalie to turn up the heat and get a blanket even though 
OPTIONS:
- Katrina was not cold.
- Natalie was not cold.
Answer: Natalie was not cold.

Problem: How does the sentence end?

Logan asked Ian to go to the pet store with him to buy a gecko because he has 2 and 
OPTIONS:
- Logan has never owned one.
- Ian has never owned one.
Answer: Logan has never owned one.

Problem: How does the sentence end?

Katrina was teaching French to Erin however 
OPTIONS:
- Katrina had been to France on vacation twice.
- Erin had been to France on vacation twice.
Answer:
Erin had been to France on vacation twice.