Take a look at the passage again:
Jonathon often tries to shock his English teacher,
Mrs. Mauzy, with weird paper topics. Such as eating tarantulas or
wearing women's underwear. Mrs. Mauzy remains nonplussed, scandalized only
by the number of fragments in Jonathon's essays.
You chose the first part, Jonathon often tries to shock his English teacher.... This part has a main clause: Jonathon is the subject; tries is the verb. A fragment will not have a main clause.
Go back to the passage to try again.