Problem: How does the sentence end?

I'm not sure if there is a greater chance of tap or bottle water being bad for you, but I prefer the 
OPTIONS:
- tap because it comes from my home.
- bottle because it comes from my home.
Answer: tap because it comes from my home.

Problem: How does the sentence end?

I always had more difficulty with the first round than the last period, because the 
OPTIONS:
- round was very chill.
- period was very chill.
Answer: period was very chill.

Problem: How does the sentence end?

Derrick was much more alert than Lawrence, so 
OPTIONS:
- Derrick didn't have to worry about falling asleep while driving.
- Lawrence didn't have to worry about falling asleep while driving.
Answer: Derrick didn't have to worry about falling asleep while driving.

Problem: How does the sentence end?

The disorder was prominent in the wolves but not in the coyotes , as 
OPTIONS:
- wolves had stronger immune responses.
- coyotes had stronger immune responses.
Answer:
coyotes had stronger immune responses.