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 one of his motivations was to help hearing - impaired people by allowing them to record and play back sounds, which could assist in their understanding of speech and sounds. The multiplex telegraph was for sending multiple messages simultaneously, the telephone was for voice communication (not primarily for the hearing - impaired), and the motion - picture machine was for visual motion pictures.

Answer:

the phonograph