Problem: How does the sentence end?

I tried to install a bird perch bar into my bird's cage, but struggled to get it in due to the 
OPTIONS:
- bar being too narrow.
- cage being too narrow.
Answer: cage being too narrow.

Problem: How does the sentence end?

There were more ants under the carport than in the yard because it was wetter in the 
OPTIONS:
- yard .
- carport .
Answer: yard .

Problem: How does the sentence end?

The woman preferred traveling by train instead of airplane because she felt the 
OPTIONS:
- train was safe.
- airplane was safe.
Answer: train was safe.

Problem: How does the sentence end?

Ben enjoyed using the hookah more than smoking a cigarette because the 
OPTIONS:
- cigarette smelled worse.
- hookah smelled worse.
Answer:
cigarette smelled worse.