Problem: How does the sentence end?

Jessica enjoyed drinking lots of milk but Betty avoided it, as 
OPTIONS:
- Jessica was intolerant of lactose.
- Betty was intolerant of lactose.
Answer: Betty was intolerant of lactose.

Problem: How does the sentence end?

The baby took formula but had to switch to breastmilk because the 
OPTIONS:
- formula hurt his belly.
- breastmilk hurt his belly.
Answer: formula hurt his belly.

Problem: How does the sentence end?

Kyle was more experienced and self confident than Jason was, because 
OPTIONS:
- Kyle was not a virgin.
- Jason was not a virgin.
Answer: Kyle was not a virgin.

Problem: How does the sentence end?

Jenny recycled her old laptop and bought a desktop computer, because the 
OPTIONS:
- laptop was too slow.
- desktop was too slow.
Answer:
laptop was too slow.