Problem: How does the sentence end?

Contracting the virus was a major concern of Jennifer but not Amy, because 
OPTIONS:
- Jennifer had a weakened immune system.
- Amy had a weakened immune system.
Answer: Jennifer had a weakened immune system.

Problem: How does the sentence end?

Laura was jealous that Jessica was in a relationship, so 
OPTIONS:
- Laura always was given dirty looks.
- Jessica always was given dirty looks.
Answer: Jessica always was given dirty looks.

Problem: How does the sentence end?

William was able to survive the tragic shipwreck that killed Kevin, because 
OPTIONS:
- William was a strong swimmer.
- Kevin was a strong swimmer.
Answer: William was a strong swimmer.

Problem: How does the sentence end?

The reason that Lindsey felt heartache while Megan felt loved was because 
OPTIONS:
- Lindsey was recently dumped.
- Megan was recently dumped.
Answer:
Lindsey was recently dumped.