Problem: How does the sentence end?

Rachel loved reading stories out of a book to Betty every night. 
OPTIONS:
- Rachel was an adult.
- Betty was an adult.
Answer: Rachel was an adult.

Problem: How does the sentence end?

More cups are needed in order to empty the vodka in the bottles. The 
OPTIONS:
- cups are big.
- bottles are big.
Answer: bottles are big.

Problem: How does the sentence end?

Sam preferred plush toy rabbits to real ones because of the nipping rabbit's teeth. The 
OPTIONS:
- plush toy rabbits are most dangerous.
- rabbit's teeth are most dangerous.
Answer: rabbit's teeth are most dangerous.

Problem: How does the sentence end?

The people don't want to treat the infection rather than the sickness, because the 
OPTIONS:
- sickness is subtle.
- infection is subtle.
Answer:
infection is subtle.