In what way was communication by telegraph an improvement over communication by mail carriage?
a. the telegraph allowed instant communication over long distances.
b. the telegraph used morse code.
c. the telegraph let messages be delivered in days instead of weeks.
d. the telegraph carried the sounds of people’s voices.

The telegraph was once a revolutionary innovation in the way the mail was sent. It represents the instant transmission of textual or symbolic messages over long distances. The original ways of transmitting a message remotely without carrying the message were visual semaphores as initial forms of telegraphy. Later the telegraph was significantly improved by the invention of electric telegraphs which, using the symbolic code, could transmit the encrypted message over long distances.

The answer is: A.

when in doubt choose c

it's what my teacher told my class when we were going into psats

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).