Problem: How does the sentence end?

My cousin was not able to put the cases on the shelves, because the
OPTIONS:
- cases were too heavy.
- shelves were too heavy.
Answer: cases were too heavy.

Problem: How does the sentence end?

I used an ax to chop down a tree, but had to get a bigger ax because the
OPTIONS:
- ax was too thick.
- tree was too thick.
Answer: tree was too thick.

Problem: How does the sentence end?

Nick got more complements on their perfume than Hunter did because
OPTIONS:
- Nick had fragrant perfume.
- Hunter had fragrant perfume.
Answer: Nick had fragrant perfume.

Problem: How does the sentence end?

The tobacco farm wasn't doing well, so they replaced the pipes with conveyors as the
OPTIONS:
- pipes were inefficient.
- conveyors were inefficient.
Answer:
pipes were inefficient.