Question

There is no sound in the vaccuum of space. Why? Select all that apply

Answer 1

#1 and #3 are correct.

#3 is slightly goofy. 
The problem is not that there's no air to vibrate your eardrum. 
The problem with no air is that there's nothing to ever bring the sound
to your head, even if you're only a foot away from the source.  There
are just NO SOUND WAVES going on at all.