Problem: How does the sentence end?

It was easier to see what was on the computer than on the phone because the 
OPTIONS:
- computer had a smaller screen.
- phone had a smaller screen.
Answer: phone had a smaller screen.

Problem: How does the sentence end?

Donald liked the taste of mayonnaise on a sandwich but Steven liked mustard better. 
OPTIONS:
- Donald bought some Duke's mayo at the market.
- Steven bought some Duke's mayo at the market.
Answer: Donald bought some Duke's mayo at the market.

Problem: How does the sentence end?

Patricia already had many years of experience with yoga, but Samantha was just a beginner. 
OPTIONS:
- Patricia took a yoga class.
- Samantha took a yoga class.
Answer: Samantha took a yoga class.

Problem: How does the sentence end?

The doctor preferred to prepare the patient with the medicine instead of the IV since the 
OPTIONS:
- medicine was potent.
- IV was potent.
Answer:
medicine was potent.