Kahlo brusquely informed Rivera that she wanted him to tell her the unvarnished truth about her work. If she could not earn her living as an artist, she announced, she would take up some other profession to help her parents. "I want you to tell me if I am a good enough artist to make it worthwhile to go on." Why would the author include this event in the biography?

It shows that Kahlo was ready to quit and live with her parents.
It describes the beginning of Kahlo's relationship with Diego Rivera.
It shows that Rivera was not kind to Frida Kahlo.
It describes Frida Kahlo's feelings about her artwork.