Choice B is the best answer. In (lines 77-82"knocked...governess"), the narrator describes Mrs. Quabarl as appearing "magnificent and autocratic," or outwardly domineer-ing, but easily "cowed and apologetic" when someone challenges, or defies, her authority.
Choices A, C, and D are incorrect because the narrator does not describe Mrs. Quabarl as selfish, bitter, or frequently imprudent.