Problem: How does the sentence end?

Christopher has much stronger arm muscles than Adam because 
OPTIONS:
- Christopher played volleyball for fifteen years.
- Adam played volleyball for fifteen years.
Answer: Christopher played volleyball for fifteen years.
sentence: Rick poured the vodka from a bottle into his flask until the  OPTIONS:
- bottle was full.
- flask was full.
complete: flask was full.
Samuel flung the pigeon into the air to free it while Jeffrey sobbed. 
OPTIONS:
- Samuel was happy about the situation.
- Jeffrey was happy about the situation.
Samuel was happy about the situation.
Input: Continue writing.

Megan created malware in her spare time until she was caught by Amy since 
OPTIONS:
- Megan is a sociopath.
- Amy is a sociopath.

Continued: Megan is a sociopath.
Story needs to be completed:
Jennifer was no longer homeless after Samantha took her in, 
OPTIONS:
- Jennifer was very generous with the new shelter.
- Samantha was very generous with the new shelter.

My choice:
Samantha was very generous with the new shelter.
Problem: How does the sentence end?

William told Joel that they were trying their patience, because 
OPTIONS:
- William was tired of cleaning up their mess.
- Joel was tired of cleaning up their mess.
Answer:
William was tired of cleaning up their mess.