The main idea of “Bernice Bobs Her Hair” is social change affects personal identity. Option B is correct.
"Bernice Bobs Her Hair" is a short story by F. Scott Fitzgerald, written in 1920.
The story focuses on Bernice, a wealthy girl from Eau Claire, Wisconsin, who goes to visit her cousin Marjorie for the month of August. Marjorie feels that Bernice is a drag on her social life. Besides, none of the boys want to dance with Bernice.