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.

where is the picture

the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.