Take a look at the passage again:
Whenever Coach Moody sees behavior that she doesn't like—either on or off
the court. The members of the girls' basketball
team pay during the next practice. When Frankie was caught smooching
her boyfriend Larry in the hallway, everyone had to run two extra miles
that afternoon.
You chose the second part, The members of the girls' basketball team pay during the next practice. This part has a main clause: members is the subject; pay is the verb. A fragment will not have a main clause.
Go back to the passage to try again.