Which of these innovations was made possible by alexander graham bell? instant communication over distance through the written word instant communication between trains instant communication over distance through speech instant communication using a special code

instant communication over distance through speech

The telephone is a device that permits two or more persons to have an instant communication over distance through speech. It was an innovation made possible by Alexander Graham Bell. He worked at a school for the deaf and it was his focus on speech, hearing and amplification led to its invention in 1876.

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The answer is instant communication over distance through speech

c or d both can be the answer