Take a look at the passage again:
Each morning when Helene is fixing her hair in the bathroom. She applies
many sticky hair products. During a typical day,
she catches more bugs in her coif than most spiders manage to land in their
webs in a week.
You chose the third part, During a typical day, she catches more bugs in her coif .... This part has a main clause: she is the subject; catches is the verb. A fragment will not have a main clause.
Go back to the passage to try again.