Answer:
Samantha's decision is best supported by D. Educational Goals.
Step-by-step explanation:
In this case Samantha is preparing to get a scholarship at her first-choice college. It can be deduced that she is thinking about her education and long-term goals, thus her decision to drink soda instead of alcohol is purely based on educational goals.
It is not based on family history since we do not have information regarding it, nor about peer or parental pressure.