Which One of the Following Most Clearly Illustrates the Gestalt

Multiple Choice

Which one of the following most clearly illustrates the Gestalt principle of figure-ground?

A) Aaron is watching the teacher's face so intently that he doesn't notice what she is writing on the chalkboard.
B) Bart has difficulty seeing the difference between the letters b and d because the two letters are so similar in appearance.
C) Caryn is lost in her thoughts.
D) Darlene has difficulty judging the size of objects more than six meters away from her.