Story needs to be completed:
Kyle was always playing football harder and rougher than Derrick because 
OPTIONS:
- Kyle was very competitive.
- Derrick was very competitive.

My choice:
Kyle was very competitive.
Problem: Continue the following story.

Felicia was a very astute investor while Carrie struggled to find good stocks. 
OPTIONS:
- Felicia often suffered a loss in their portfolio.
- Carrie often suffered a loss in their portfolio.
Here's how I want to continue it: Carrie often suffered a loss in their portfolio.
Problem: The child of Natalie was better at math than the child of Rebecca, as a result of 
OPTIONS:
- Natalie being a math teacher.
- Rebecca being a math teacher.

My choice: Natalie being a math teacher.
[Q]: How does the sentence end?

The flooring in Victoria's house was cracking up unlike Erin's house since 
OPTIONS:
- Victoria 's foundation is shaky.
- Erin 's foundation is shaky.

[A]: Victoria 's foundation is shaky.
QUES: Continue writing.

Trying to understand the concept, Christine asked Sarah to help her with a geometry problem, as 

OPTIONS:
- Christine had weak math skills.
- Sarah had weak math skills.
+++++++++
ANS: Christine had weak math skills.
QUES: Continue writing.

Rebecca had a and easier time skiing when Angela guided her, as 

OPTIONS:
- Rebecca was very confident of herself on the trails.
- Angela was very confident of herself on the trails.
+++++++++
ANS:
Angela was very confident of herself on the trails.