Once upon a time, a boy fell in to a giant sewer, climbed back up and thats the end.
Author Last, First. Title. City: Publisher, year. Print.
Option D, because it adds additional information to the sentence, telling us that Jose and Margot were the only two students
A word or phrase that modifies a word not included in the sentence is a B. dangling modifier.
For example:
Knowing that it was getting cold outside, the pizza tasted very good.
