It conducts vibrations from speaker to receiver. It magnifies a person's voice. It carries the sounds through wires. It converts vibrations to electrical signals.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: How is a telephone able to transmit sound?
Possibilities:
- It conducts vibrations from speaker to receiver.
- It magnifies a person's voice.
- It carries the sounds through wires.
- It converts vibrations to electrical signals.

It converts vibrations to electrical signals.