Which of the following scenarios is an example of using potentially copyrighted material?
A. Burt started saying "You're a gold star!" each time someone scored a point on the basketball team after he heard Dennis start using the phrase.
B. Sacha wears a pair of legwarmers, and her older sister Fawn argues that she made legwarmers a local trend.
C. Fred uses a voice recording of Sally for his next music video.
D. Tina decided to use a dance routine that her instructor created and showed her for one of her theatrical productions.