[mrs. pontellier] was somewhat familiar with such scenes. they had often made her very unhappy. on a few previous occasions she had been completely deprived of any desire to finish her dinner. sometimes she had gone into the kitchen to administer a tardy rebuke to the cook. once she went to her room and studied the cookbook during an entire evening, finally writing out a menu for the week, which left her harassed with a feeling that, after all, she had accomplished no good that was worth the name. which best explains how the excerpt is evidence of an emerging theme that is central to the novel?