Which of the following best describes absorption of a wave?

A. As a wave reaches the interface between two different media, its direction of motion changes, and it remains in the first medium.

B. As a wave moves from one medium into another in which its speed is different, the wave changes direction.

C. As a wave moves from one medium to another, the energy of the wave is converted to other forms of energy.

D. As a wave moves around a corner or through an opening, its direction of motion changes.