OE
The author begins by describing the Arnolfini Portrait and discusses some evidence for a common interpretation: The painting is a “marriage contract of sorts.” The author goes on to say that other art historians have reasons to doubt this interpretation. As a result, (D) is the best description of the author’s purpose.
Both (A) and (E) are too specific; the author does describe the painting and makes mention of marriage customs as evidence, but neither of these is the focus of the passage.
(B) and (C) are extreme; the author doesn’t go as far as to condemn the interpretation or say that it is faulty, nor is the author interested in presenting her own interpretation of the painting.
Answer: D