Nick received a electric toothbrush from Eric and 
OPTIONS:
- Nick decided to buy one for themselves.
- Eric decided to buy one for themselves.
Eric decided to buy one for themselves.

Maria had bad eyes and needed glasses but Katrina did not. 
OPTIONS:
- Maria went to the ophthalmologist.
- Katrina went to the ophthalmologist.
Maria went to the ophthalmologist.

Steven helped Hunter to develop a training regimen, because 
OPTIONS:
- Steven was more inexperienced in the skill.
- Hunter was more inexperienced in the skill.
Hunter was more inexperienced in the skill.