Will you get the subjects you want to study in college? I hope so.
a feeling that something good will probably happen
thinking that this would happen (It may or may not have happened.)
stopped believing that this good thing would happen
wanting something to happen (and thinking it quite possible)
showing concern that what you say should not offend or disturb the other person: a way of being polite
wishing for something to happen, although this is very unlikely
Explanation
Option (D) is correct because the sentence 'Will you get the subjects you want to study in college? I hope so.' expresses a desire for a positive outcome (getting the chosen subjects) along with the belief that it is quite possible. In this context, 'hope' means wanting something to happen and thinking it is quite possible, which perfectly aligns with the speaker's optimism about college admissions.