What word best describes Leo's feelings when Stargirl sings Happy Birthday to Hillari (to him) ?

A. Excited

B. Boastful

C. Mortified

D. Angered

The correct answer is C: Mortified, which means "embarrassed" or "humiliated".

Explanation:

In the book named "Stargirl", there is a scene in the lunchroom where the character called "Stargirl" embarrasses another character called "Leo". How did it happen? Stargirl embarrassed Leo by standing in front of everybody in the lunchroom and singing "Happy Birthday" to Leo even though it was not actually Leo's birthday. In fact, it was Hillari Kimble's birthday, but Hillari had earlier informed Stargirl that there would dire consequences if Stargirl sings to her on her birthday.