TOEFL Listening: ETS-TOEFL听力机经 - 1GCM02D4S3KC8M1ZP$

Why does the professor describe ways in which light is depicted in Girl with a Pearl Earring? A. To make a point about the quality of paint used by Vermeer B. To imply that Vermeer's style was in transition when the painting was made C. To point out the precision of Vermeer's observations D. To give an example of Vermeer's masterful painting technique