Answer:
C
Explanation:
A doesn't make sense because you would be more friendly and casual with your friend, especially through text
B doesn't make sense because you'd probably be casual towards your co-worker
C makes sense because a College admissions office is a big deal and you want to act formally towards them, you wouldn't act friendly or casually with them
D doesn't make sense because they're your best friend- you'd act casual and friendly
