Review the passage:
Horrified, Sherri stared at her reflection in the mirror.
Hair sticking out in seventeen different directions, a spot of whipped cream
on her chin, and a green pen mark across her nose. Why had her friends at
the table not mentioned her disarray?
You chose the first part, Horrified, Sherri stared at her reflection in the mirror. This part has a main clause: Sherri is the subject; stared is the verb. A fragment will not have a main clause.