ASAP mark Brainliest, Which of these details does not support the central idea central idea: even though one of Edison’s investors failed, he never stopped trying out new ideas

I’m pretty certain it’s d because it does not state anywhere that the sound waves are not powerful enough to make the vocal engine useful. hope this helps brainlist would be much appreciated :)

The answer is the 4th option

Answer( he"ll) is correct

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