Problem: Natalie was more tired than Betty because

My choice: Natalie had been running on the treadmill all day.

Problem: Samuel is more consistent with studying each day after school than Hunter so

My choice: Hunter gets bad grades.

Problem: Karl chose to paint his jeans with fabric paint instead of spray paint since the

My choice: spray paint would not paint easily on the fabric.

Problem: Christopher took a trip and went to visit Brett's home in Asia because

My choice:
Christopher wanted to travel to another country.