[Q]: How does the sentence end?

Justin asked Christopher if they knew a good hair dye, because 
OPTIONS:
- Justin frequently dyed their hair.
- Christopher frequently dyed their hair.

[A]: Christopher frequently dyed their hair.
QUES: Continue writing.

the music did not sound great through the speakers because the 

OPTIONS:
- music  was trembling.
- speaker  was trembling.
+++++++++
ANS: speaker  was trembling.
Problem: How does the sentence end?

Henry fixed the door and not the wall in the apartment because the 
OPTIONS:
- door was just fixed.
- wall was just fixed.
Answer: wall was just fixed.
sentence: Since Kayla has an eating disorder and Felicia does not,  OPTIONS:
- Kayla is comfortable with her weight and her body's appearance.
- Felicia is comfortable with her weight and her body's appearance.
complete: Felicia is comfortable with her weight and her body's appearance.
Felicia made a dollar more an hour than Betty because 
OPTIONS:
- Felicia had more experience in their field.
- Betty had more experience in their field.
Felicia had more experience in their field.
Problem: Continue the following story.

Christopher found it easy to shake off the taunts of their haters but Nelson couldn't. 
OPTIONS:
- Christopher had a very aggressive demeanor.
- Nelson had a very aggressive demeanor.
Here's how I want to continue it:
Nelson had a very aggressive demeanor.