Question

which of these inventions arose from an attempt to help hearing - impaired people?
○ the multiplex telegraph
○ the telephone
○ the phonograph
○ the motion - picture machine

Explanation:

The phonograph was invented by Thomas Edison, and part of his motivation was to help hearing - impaired people by recording and playing back sound so that they could experience sound. The multiplex telegraph was for sending multiple messages simultaneously, the telephone was for general communication, and the motion - picture machine was for visual entertainment and recording, not primarily for helping the hearing - impaired.

Answer:

the phonograph