Take a look at the passage again:
Day after day, thunderclouds rolled in during the
early afternoon. Making Madison's grass thrive from all of the water.
Her neighbors, however, prayed for a sunny afternoon so that Madison could
finally mow the jungle that was the front yard.
You chose the first part, Day after day, thunderclouds rolled in during the early afternoon. This part has a main clause: thunderclouds is the subject; rolled is the verb. A fragment will not have a main clause.
Go back to the passage to try again.