Problem: How does the sentence end?

It's better to use natural shampoo for your hair than synthetic shampoo as the 
OPTIONS:
- natural shampoo is harmful for your hair.
- synthetic shampoo is harmful for your hair.
Answer: synthetic shampoo is harmful for your hair.

Problem: How does the sentence end?

Nick needed a splint on their arm but not Michael because 
OPTIONS:
- Nick had a healthy arm.
- Michael had a healthy arm.
Answer: Michael had a healthy arm.

Problem: How does the sentence end?

Running in a marathon suited Nelson but not Michael because 
OPTIONS:
- Nelson had practiced long distance running for years.
- Michael had practiced long distance running for years.
Answer: Nelson had practiced long distance running for years.

Problem: How does the sentence end?

Kim threw out the dairy from the refrigerator and kept the meat since the 
OPTIONS:
- dairy was spoiled.
- meat was spoiled.
Answer:
dairy was spoiled.