Problem: How does the sentence end?

Katrina had an electric guitar, and Carrie had an acoustic, so 
OPTIONS:
- Katrina needed an amp for their instrument.
- Carrie needed an amp for their instrument.
Answer: Katrina needed an amp for their instrument.
sentence: Monica studied hard in college unlike Kayla, who partied a lot, so  OPTIONS:
- Monica 's medical school application was accepted.
- Kayla 's medical school application was accepted.
complete: Monica 's medical school application was accepted.
The clothes Justin were wearing were much newer than Joseph's because 
OPTIONS:
- Justin has less money.
- Joseph has less money.
Joseph has less money.
Input: Continue writing.

Nick drank much more water than Joseph did so 
OPTIONS:
- Nick ended up losing more weight.
- Joseph ended up losing more weight.

Continued: Nick ended up losing more weight.
Story needs to be completed:
Randy was more adept at measuring surfaces than Kenneth because 
OPTIONS:
- Randy was a trained professional.
- Kenneth was a trained professional.

My choice:
Randy was a trained professional.
Problem: How does the sentence end?

The beach was Felicia's dream vacation but Natalie's nightmare. 
OPTIONS:
- Felicia was freaked out by the crabs and fish.
- Natalie was freaked out by the crabs and fish.
Answer:
Natalie was freaked out by the crabs and fish.