Passive. Voice because it says was not
Answer:
Thomas A. Watson, one of Bell's assistants, was trying to reactivate a telegraph transmitter. Hearing the sound, Bell believed that he could solve the problem of sending a human voice over a wire. He figured out how to transmit a simple current first, and received a patent for that invention on March 7, 1876.
Explanation:
c because i looked it up in an article
Respect part of it cuzz if you don't show respect you wouldn't get it
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