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:

Alexander Graham Bell was working on a device to help the hearing - impaired when he invented the telephone. The other inventions were not primarily developed for this purpose. The multiplex telegraph was for sending multiple messages over a single wire, the phonograph for recording and playing sound, and the motion - picture machine for creating moving images.

Answer:

the telephone