Problem: How does the sentence end?

The man tried to put the folder on the stand but the 
OPTIONS:
- stand was too large.
- folder was too large.
Answer: folder was too large.
sentence: The student chose to play the flute instead of the clarinet because she thought the  OPTIONS:
- flute would be difficult to learn.
- clarinet would be difficult to learn.
complete: clarinet would be difficult to learn.
Rachel was fully healed at the medical practice run by Sarah, because 
OPTIONS:
- Rachel was sick.
- Sarah was sick.
Rachel was sick.
Input: Continue writing.

Ryan must be more careful than Ian when putting up their washcloths because 
OPTIONS:
- Ryan owns a pet hamster.
- Ian owns a pet hamster.

Continued: Ryan owns a pet hamster.
Story needs to be completed:
The lungs reacted badly to the infection, while the kidneys were resilient against it.  The 
OPTIONS:
- lungs were robustly tolerant to the virus.
- kidneys were robustly tolerant to the virus.

My choice:
kidneys were robustly tolerant to the virus.
Problem: How does the sentence end?

We moved the camping trip from the park to the mountain, since the 
OPTIONS:
- park had become hostile territory.
- mountain had become hostile territory.
Answer:
park had become hostile territory.