[Q]: How does the sentence end?

Brett traveled to many countries while Benjamin was insular, so 
OPTIONS:
- Brett was surprised by the existence of bonsai trees.
- Benjamin was surprised by the existence of bonsai trees.

[A]: Benjamin was surprised by the existence of bonsai trees.
QUES: Continue writing.

His donation towards clearing the debt of the charity didn't help because the 

OPTIONS:
- donation was too large.
- debt was too large.
+++++++++
ANS: debt was too large.
Problem: How does the sentence end?

He raked lots of money by selling his coins but not so by selling CDs, it seems the 
OPTIONS:
- CDs were common items.
- coins were common items.
Answer: CDs were common items.
sentence: Rachel wanted to take baby steps when getting to know Elena, because  OPTIONS:
- Rachel had a fear of intimacy.
- Elena had a fear of intimacy.
complete: Rachel had a fear of intimacy.
Megan had to buy puppy training pads but not Katrina because 
OPTIONS:
- Megan had an indoor dog.
- Katrina had an indoor dog.
Megan had an indoor dog.
Problem: Continue the following story.

During recess, Mary would play in the sandbox with their friends unlike Maria because 
OPTIONS:
- Mary asocial.
- Maria asocial.
Here's how I want to continue it:
Maria asocial.