Paragraph 2 answers which of the following questions about paintings by Vermeer? A. What characteristics of Vermeer's paintings suggest that he may have used a camera obscura? B. Why did Vermeer produce only about 30 paintings? C. Do Vermeer's paintings in general suggest that he was unable to paint accurately without using a camera obscura? D. Why did Vermeer need to draw an image on the canvas of the painting that was X-rayed if he was using a camera obscura?