What device used electrical signals to send messages quickly over long distances?

• A. Semaphore
• B. Telegraph
• C. Printing press
• D. Telephone

Answer: (B)

The idea being tested is using electrical signals to move information quickly over long distances. The telegraph did exactly that: it sent coded electrical pulses along wires, which trained operators translated into letters using Morse code. This allowed messages to travel far faster than any prior method and helped connect cities and continents in near real time. Other options rely on sight (semaphore), reproduce printed text (printing press), or transmit voice (telephone) rather than sending rapid coded messages over long distances, and they don’t capture the historical shift to rapid long-distance signaling as clearly as the telegraph.