1. Waves carry radio signals.
2. Particles in Earth's atmosphere reflect them.
3. Receivers convert them into sound.
Step-by-step explanation:
Actually Radio waves are not the sound waves and they are the charged particles and we cannot hear them as such. In the earth's atmosphere, these charged particles reflects the radio signals and then send it to the receiver which then converts that into sound.
So the last option is the answer.
1. Waves carry radio signals.
2. Particles in Earth's atmosphere reflect them.
3. Receivers convert them into sound.