Answer:
C. The way you look does not always reflect who you want to be.
Step-by-step explanation:
The passage shows that he is ashamed of how he looks in the mirror, given that he was saddened at the sight of his crooked teeth. This rules out A (It is important to be proud of your heritage) and B (Understanding your background can make you a happier person) as they show nothing of looks.
D would be a viable answer if the passage showed more on him (Alfonso) being bullied or called names.
However because of these reasons, the answer is C.
Hope this helps!