Problem: How does the sentence end?

The gemstone that he found on the mountain top was better than the stone because the 
OPTIONS:
- gemstone was common.
- stone was common.
Answer: stone was common.
sentence: The consultant seized the opportunity by writing the note with a pencil instead of a pen because the  OPTIONS:
- pencil was locked away.
- pen was locked away.
complete: pen was locked away.
Jennifer was obsessed with social media but Victoria couldn't care less about it. 
OPTIONS:
- Jennifer constantly checked Facebook.
- Victoria constantly checked Facebook.
Jennifer constantly checked Facebook.
Input: Continue writing.

The man decided to keep the frogs as pets and feed them hotdogs rather than cookies because the 
OPTIONS:
- cookies are tolerable for frogs.
- hotdogs are tolerable for frogs.

Continued: hotdogs are tolerable for frogs.
Story needs to be completed:
Logan evaluated the condition of Kyle to make sure they were ok, since 
OPTIONS:
- Logan was a doctor.
- Kyle was a doctor.

My choice:
Logan was a doctor.
Problem: How does the sentence end?

Carrie thought Samantha was a horrible driver because 
OPTIONS:
- Carrie witnessed the multi-car pileup on the freeway.
- Samantha witnessed the multi-car pileup on the freeway.
Answer:
Carrie witnessed the multi-car pileup on the freeway.