Story needs to be completed:
So 
OPTIONS:
- William was happy because William had managed to steal a valuable painting from the house of Christopher.
- Christopher was happy because William had managed to steal a valuable painting from the house of Christopher.

My choice:
William was happy because William had managed to steal a valuable painting from the house of Christopher.
Problem: Continue the following story.

Jan wanted to buy the leggings to replace her jeans because the 
OPTIONS:
- jeans were a lighter fabric.
- leggings were a lighter fabric.
Here's how I want to continue it: leggings were a lighter fabric.
Problem: Victoria was very good at sculpting but Angela was very bad at it. 
OPTIONS:
- Victoria got a low grade in art class.
- Angela got a low grade in art class.

My choice: Angela got a low grade in art class.
[Q]: How does the sentence end?

Christine had a flower garden that was twice as big as Maria's since 
OPTIONS:
- Christine had less time to tend to it.
- Maria had less time to tend to it.

[A]: Maria had less time to tend to it.
QUES: Continue writing.

Samantha goes to Mary to buy some supplements in powder form because 

OPTIONS:
- Samantha is a customer.
- Mary is a customer.
+++++++++
ANS: Samantha is a customer.
QUES: Continue writing.

Monica hated flying more than Samantha because 

OPTIONS:
- Monica never pictured the plane crashing after takeoff.
- Samantha never pictured the plane crashing after takeoff.
+++++++++
ANS:
Samantha never pictured the plane crashing after takeoff.