Read the following context and choose the best option to answer the question.
Context: We all could , could n't we ? I just wished I had had so much fun too . Aussi , YC is leaving real real soon . When school started I thought I could ask her out somemore and hang out more and as I caught up in my own reverie , I lost track of time and now I have what , 22 days left till she flies of the Land Of Unknown .
Question: Why is the narrator a bit sad ?
Options: 
A. Their Aussi friend is leaving .
B. Their school lab partner is leaving .
C. Their best friend is leaving school .
D. Their crush is leaving .


D