The answer is B. They believed children should be carefree.
If you look at the mother, she seems to be hard at work, and even though the stress seems to be towing on her, she rather have her daughter play and be "free", than be burdened by labor and stress.
<h2><u>These nervous troubles are dreadfully depressing”, wrote Charlotte Perkins Gilman in her short story, The Yellow Wallpaper. ... The Yellow Wallpaper enlightens the reader on women's health, motherhood, mental breakdown and its treatment, as well as feminism and gender relations in late 19th-century America.</u></h2>