[Q]: How does the sentence end?

Christopher practiced fire safety and Derrick did not, so 
OPTIONS:
- Christopher remained calm when the fire alarm at the office building went off.
- Derrick remained calm when the fire alarm at the office building went off.

[A]: Christopher remained calm when the fire alarm at the office building went off.


[Q]: How does the sentence end?

Brett talked Eric into learning Spanish, it was obvious to the teacher that 
OPTIONS:
- Brett was a slower learner.
- Eric was a slower learner.

[A]: Eric was a slower learner.


[Q]: How does the sentence end?

John wanted to install a shelf for his cactus but the 
OPTIONS:
- shelf was too narrow.
- cactus was too narrow.

[A]:
shelf was too narrow.