ANSWER IS D! Well at least it should be, thats what it said on my test.
Answer:
5 Fun Facts on Costume designer Sandy Powell Cinderella Dress. Let It Flow: 1) The dress needed to seamlessly float behind Cinderella as she ran down the stairs to her beautiful carriage before midnight. In order for the gown to have a romantic glow in the moon light and appear weightless.
B. Perspective. This is because the painting is composed not as a flat piece, but with an arch in front and more pieces of notice in the back