Question

the invention of the telephone made what form of communication obsolete during the american industrial revolution? the telegraph the microphone the phonograph

Explanation:

The telephone, invented during the American Industrial Revolution, made the telegraph obsolete. The telegraph was a prior communication method that used Morse code. The telephone offered a more direct and immediate form of voice - based communication, replacing the need for the telegraph's slower, code - based system. The microphone is a component of the telephone, not a separate communication form made obsolete. The phonograph is for recording and playing sound, not a communication method like the telegraph.

Answer:

the telegraph