Problem: How does the sentence end?

Amy was installing Carrie's new water heater for 
OPTIONS:
- Amy forgot how to put them together.
- Carrie forgot how to put them together.
Answer: Carrie forgot how to put them together.
sentence: The developer scrapped the plans to build offices, and instead moved forward with building apartments, because there was high demand for the  OPTIONS:
- offices .
- apartments .
complete: apartments .
Jessica 's dance routine had more polish than Erin 's because 
OPTIONS:
- Jessica practiced so little.
- Erin practiced so little.
Erin practiced so little.
Input: Continue writing.

The business of Benjamin is exceedingly well compared to Adam's because 
OPTIONS:
- Benjamin works hard everyday.
- Adam works hard everyday.

Continued: Benjamin works hard everyday.
Story needs to be completed:
The new armor John bought for himself will not fit through his doorway, the 
OPTIONS:
- armor was too narrow.
- doorway was too narrow.

My choice:
doorway was too narrow.
Problem: How does the sentence end?

Justin makes friends easily but Kenneth doesn't. 
OPTIONS:
- Justin has very few friends in their life.
- Kenneth has very few friends in their life.
Answer:
Kenneth has very few friends in their life.