The best answer to how the author of Text 2 would likely respond to the underlined claim in Text 1 is:
(Choice A) Self-Portrait at the Keyboard was painted earlier than Carracci’s painting and also refers to the artist’s craft.
This is because the author of Text 2 states that Lavinia Fontana's painting is the earliest example of a self-portrait from a Bolognese artist that refers to the act of painting, which contradicts the claim in Text 1 about Carracci being the first artist to depict himself painting.