The telephone, invented in 1876, converted acoustic sound to electric signals. however, the audio production industry began using the electrical recording system only in 1925. why was there a delay in using this technology in audio production?
the missing piece of technology that prevented the audio production industry from using the electrical recording system earlier was a device that could blank the electric signal. the device that made this possible was the blank

fill in the blank

a amplify
b codify
c transmit

a stylus
b diaphragm
c audion valve

are the correct answers.

Explanation:

The telephone, invented in 1876, converted acoustic sound to electric signals. However, the audio production industry began using the electrical recording system only in 1925.

The missing piece of technology that prevented the audio production industry from using the electrical recording system earlier was a device that could codify the electric signal. The device that made this possible was the Diaphragm.

given the options, i would say your best bet is c. the modem supports up to 56 kbps, which is too low for video streaming. dial up modems use actual phone lines, which only can go up to 56 kbps as that's more than sufficient for traditional phone calls. this is also the reason why when a dial-up modem connects, you hear all those sounds. it's literally using the phone line to establish a connection.

this seems to be in the wrong category. but i'll take some free points my dude

posting this in wrong category will result in people seeing it who won't know the answer.