Read the following passage and answer the question below. The invention of the telephone in 1876 by Alexander Graham Bell marked a turning point in human communication, allowing voices to be transmitted across distances instantaneously for the first time. Before the telephone, long-distance communication relied heavily on the telegraph, which could only send coded messages rather than actual speech. Bell's device converted sound waves into electrical signals that could travel through wires and be converted back into sound at the receiving end. Early telephones required operators to manually connect calls through switchboards, a labor-intensive process that limited how quickly calls could be placed. Over the following decades, automatic switching systems, direct dialing, and eventually digital and wireless technology transformed the telephone from a novelty into an essential tool of daily life. Today's smartphones, which combine calling capability with countless other functions, trace their origins directly back to Bell's original invention nearly one and a half centuries ago. Question: What is the passage primarily about?
- A. The history of the internet
- B. The invention of the telephone and its evolution into modern communication technology ✓
- C. The design of modern switchboards
- D. The invention of the radio
Correct answer
B. The invention of the telephone and its evolution into modern communication technology
Explanation
The passage traces the telephone from its invention to its role in modern smartphones.