Which statement BEST explains how Sissy's actions advance the plot of the Passage?
Her unsatisfactory answers spur Gradgrind onto
further questioning.
Her unsatisfactory answers earn her classmates'
sympathy all day.
Her nervous habits demonstrate her increasing
terror of Gradgrind.
Her nervous habits show how challenging school
has become for her.

Subplots are made in the story as a supplementary or support to the main plot. These are related to the main thread in terms of the setting, time and the atmosphere. The characters involved may be the main characters and the supporting characters. The answer here is A.. to provide details on the main storyline.