Answer : The correct option is, (a) both air and space
Explanation :
There are two types of waves :
Electromagnetic waves : These are waves which can travel through vacuum. They travel with the speed of light. They does not require a medium to travel.
For Example: Infrared waves, Microwaves
Mechanical waves : These are the waves that require a medium to travel so that they can transport their energy from one location to another.
For Example: Sound waves
Hence, electromagnetic radiation moves as electromagnetic waves, these waves can move through both air and space.