The correct answer is A. Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves are transverse waves, which means that the electric and magnetic fields oscillate perpendicular to the direction of propagation. They do not require a medium to propagate, and they can travel through the vacuum of space.
Interference is the phenomenon that occurs when two waves overlap, creating a new wave with a different amplitude. Diffraction is the bending of waves around obstacles. Both interference and diffraction are properties of waves that require a medium to propagate.
Electromagnetic waves can interfere and diffract, but only when they interact
with matter. For example, when light passes through a slit, it creates an interference pattern on a screen behind the slit. This is because the light waves are diffracted by the edges of the slit.However, electromagnetic waves can also travel through empty space, where there is no matter to interact with. In this case, they do not interfere or diffract.
For example, radio waves can travel through the vacuum of space to reach satellites and other planets. They do not interfere or diffract with each other, which is why we can receive clear radio signals from distant sources.