Answer:
A. a space where no particles or matter exist
Step-by-step explanation:
Vacuums are completely empty spaces.
Vacuums
In everyday life, the space around us seems empty because air is clear, but in reality, billions of particles surround us constantly. This is because we do not live in a vacuum. In a true vacuum, there are no particles. This means that no objects or air exist within a vacuum. The only true vacuum we know of is outer space. Outer space is almost entirely empty space with nothing filling it. On earth, we can attempt to achieve vacuums in small tubes, but only partial vacuums can be reached.
Radiation
The main types of heat transfer are convection, conduction, and radiation. Convection works through the movement of fluids. Since vacuums have no particles, convection cannot work. Additionally, conduction requires particles to be touching. So, it is also not possible in a vacuum. However, radiation travels through electromagnetic waves, which do not require a medium (particles). This means it can travel through a vacuum.