What is the difference between Rap music and K-Pop music?

With the downplay of emotion in classical music, music from this period doesn't usually exhibit the traits necessary for enduring quality.

Artists best achieve contrast in a composition by: a. drawing with realism b. shading a drawing with dark and light values c. using drawing techniques like stippling and hatching d. focusing on line and shape in a drawing

For the difference command to work, what needs to happen?