Obi Wan hears the destruction of a planet and all of its people through 'the force'. These sounds are only in his head and are not carried through space, since space has no through which sound could transmit.

medium

Explanation:

A sound medium is defined as channel through which sound can travel or be transmitted.

Sound medium could be in the form gases, liquids, solids or plasmas. Space is made up of vacuum and therefore, has no medium within it. Hence, space cannot transmit sound in any form or allows sound to travel through it.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

cant without the picture! ?