Problem: How does the sentence end?

In the kitchen, Rebecca was excited about the smell of cheese, while Emily gagged. 
OPTIONS:
- Rebecca was not used to the smell.
- Emily was not used to the smell.
Answer: Emily was not used to the smell.

Problem: How does the sentence end?

Elena gave advice to Sarah about being in a good relationship, and 
OPTIONS:
- Elena listened to their advice.
- Sarah listened to their advice.
Answer: Sarah listened to their advice.

Problem: How does the sentence end?

Windows computers was the best for Erin but Felicia preferred Apple Mac. 
OPTIONS:
- Erin had used PCs since they were a child.
- Felicia had used PCs since they were a child.
Answer: Erin had used PCs since they were a child.

Problem: How does the sentence end?

Megan wanted to buy a new pet from Rebecca so 
OPTIONS:
- Megan showed what tropical fish she had for sale.
- Rebecca showed what tropical fish she had for sale.
Answer:
Rebecca showed what tropical fish she had for sale.