Space is basically a vacuum, meaning it is void of matter or to be more accurate, the matter are very far apart. Now sound and vibrations need matter for them to travel through. Sound is also a type of vibration, and they can only travel through a medium (made up of matter) for them to move along. Since the astonaut is in space, then he won't feel vibrations or hear the sound of the expolosion..
On the other hand, light is an EM wave or an electromagnetic wave. Electromagnetic waves can travel through a vacuum. So the answer would be B.
