Answer
These sounds are only in his head and are not carried through space, since space has no medium through which sound could transmit.
Step-by-step explanation
Sound travels by causing materials to vibrate and in the process of that vibration carry sound waves along. Unlike electromagnetic waves, sound waves do not travel in a vacuum. The information of the destruction can not be carried through space as there is no medium whose vibrations can carry it. The correct answer is medium.