Suppose that you are watching a science fiction film involving two space ships in the deep void of outer space. In the film, an explosion occurs on space ship A. After seeing the fiery blast from a long distance away, the occupants of space ship B hear the loud boom of the blast. This is an example of_______

a. sound behaving as a mechanical wave
b. sound behaving as an electromagnetic wave
c. sound behaving as a pressure wave
d. sound traveling slower than light
e. bad physics since sound could never traverse the empty space from ship A and ship B