Lila wants to call a friend using her cell phone. Which statement best describes what must take place in order for Lila's friend to hear her over the phone?
Sound waves travel directly from Lila's phone to her friend's phone.
B Radio waves travel to a satellite in orbit around Earth and then to her friend's phone.
Sound waves travel through a series of wires so that the phone receptor will pick up a signal.
D Radio waves travel through a series of towers before sending a signal to her friend's phone.