Your answer would be, Letter choice (C), "OLD HABITS DIE HARD", Because, from the readings, Cara has bitten, or chewed on the pens so much, however, her mom told her to stop, and she continues. "Bad Habits", Ex. Trichotillomania, a person who pulls his or hair out, or bite his or her nails, pulls his or skin for satisfaction. Stops for a while, and then starts again. sorry for the long explanation. But, "OLD HABITS DIE HARD', seems like the best explanation of this short adage. - Thanks -
Hope that helps!!!