Problem: How does the sentence end?

Dennis's boyfriend likes to talk a lot, while Hunter's is quiet, due to 
OPTIONS:
- Dennis 's boyfriend being shy.
- Hunter 's boyfriend being shy.
Answer: Hunter 's boyfriend being shy.
sentence: Although from competing agencies, Patricia asked Tanya to work with them, because  OPTIONS:
- Patricia needed help with the project.
- Tanya needed help with the project.
complete: Patricia needed help with the project.
Brian asked Kenneth to sharpen his knives for him by tomorrow because 
OPTIONS:
- Brian is a pro knife sharpener.
- Kenneth is a pro knife sharpener.
Kenneth is a pro knife sharpener.
Input: Continue writing.

Dennis helped Derrick replace his broken lawn mower blade because 
OPTIONS:
- Dennis was an experienced mechanic.
- Derrick was an experienced mechanic.

Continued: Dennis was an experienced mechanic.
Story needs to be completed:
Mary painted a mirror and wanted to hang it on the wall but it did not fit. The 
OPTIONS:
- mirror was too big.
- wall was too big.

My choice:
mirror was too big.
Problem: How does the sentence end?

Adam had a personality disorder that caused rudeness to happen. 
OPTIONS:
- personality disorder was responsible for it.
- rudeness was responsible for it.
Answer:
personality disorder was responsible for it.