[Q]: How does the sentence end?

The man had many conflicts with Christine but not Cynthia because 
OPTIONS:
- Christine was a mean and grumpy person.
- Cynthia was a mean and grumpy person.

[A]: Christine was a mean and grumpy person.
QUES: Continue writing.

She wondered if the tea or milk would be a better drink, but the 

OPTIONS:
- milk wasn't an option because of her diet.
- tea wasn't an option because of her diet.
+++++++++
ANS: milk wasn't an option because of her diet.
Problem: How does the sentence end?

Neil was very talkative but Samuel was very shy so 
OPTIONS:
- Neil naturally had many friends.
- Samuel naturally had many friends.
Answer: Neil naturally had many friends.
sentence: Sarah wanted to keep the squash in her garden and pick all the pumpkin so she worked until the  OPTIONS:
- pumpkin patch was full.
- squash patch was full.
complete: squash patch was full.
The guard was on high alert during the night and kept his blade near him but not his gun because the 
OPTIONS:
- blade was reliable.
- gun was reliable.
blade was reliable.
Problem: Continue the following story.

Brian was able to calculate the difficult problem in his head unlike Randy because 
OPTIONS:
- Brian was a mathematician.
- Randy was a mathematician.
Here's how I want to continue it:
Brian was a mathematician.