Problem: How does the sentence end?

The baby of Monica is sick, but Jessica's is very healthy because 
OPTIONS:
- Monica feeds her baby a crappy diet.
- Jessica feeds her baby a crappy diet.
Answer: Monica feeds her baby a crappy diet.

Problem: How does the sentence end?

Jane tried to clean the window with the sponge but she was unsuccessful because the 
OPTIONS:
- sponge was too small.
- window was too small.
Answer: sponge was too small.

Problem: How does the sentence end?

Filling water balloons was fun for Jennifer but not for Sarah because 
OPTIONS:
- Jennifer had a serious personality .
- Sarah had a serious personality .
Answer: Sarah had a serious personality .

Problem: How does the sentence end?

Jennifer got pregnant from Natalie, so 
OPTIONS:
- Jennifer had to be really supportive when it was time for the baby to come out.
- Natalie had to be really supportive when it was time for the baby to come out.
Answer:
Natalie had to be really supportive when it was time for the baby to come out.