During a lesson on waves, Ms. Chavez asks her students to stand side-by-side in a long line and link elbows. She asks them to be ready to squat when someone tugs their elbow down and stand back up when someone tugs their elbow up. Ms. Chavez goes to one end of the line, links elbows, squats and stands back up. As she squats, she naturally tugs downward on the elbow of the student next to her, who then tugs downward on the next student and so on. As she stands again she naturally tugs upward on the student next to her, and the signal moves down the line. The result is a wave that starts with Ms. Chavez and travels down the line of students. Each student squats and stands as the wave passes.Which of the following concepts about waves is Ms. Chavez most likely trying to teach?A. the nature of a wavelengthB. the nature of a transverse waveC. the nature of a longitudinal waveD. the nature of a sound wave

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