X-rays of a possible Michelangelo self-portrait reveal an earlier painting of a woman’s face. Either Michelangelo or someone else painted over that earlier image. Because the same face appears in authenticated Michelangelo works, the new portrait is judged authentic. Which assumption is needed?
A painter reusing another artist’s canvas is usually influenced by the first artist’s style.
Several authenticated Michelangelo canvases contain under-images repeated in his other works.
Subjects in authenticated Michelangelo works are unlikely to occur as under-images on canvases not attributed to him.
No canvas can be attributed with certainty without X-ray analysis.
Correct answer: (C) Subjects in authenticated Michelangelo works are unlikely to occur as under-images on canvases not attributed to him.
Explanation
To use the shared face as an identifying sign, the argument must assume it is relatively distinctive of Michelangelo’s canvases. C supplies that missing link. If other artists commonly reused such images, the under-image would not establish who painted the visible portrait. A, B and D do not supply the required exclusion.
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