Question

alexander graham bell won a united states patent for the telephone in 1876. a patent meant that no one else could claim that they had invented the telephone. bell began working with telegraph machines. he wanted to send sound waves over a telegraph wire using a multi - reed system. he did not have the equipment to experiment with his idea. then alexander met thomas watson. watson was an electrical designer who became alexanders assistant. they found that only one reed was needed to make sounds. together the men built a telegraph that could send sounds. the waves did not sound like voices yet. on march 7, 1876, bell received the patent for his invention. bell kept working on the telephone. on march 10 of the same year, bell and watson made the telephone work. bell sent a telegram to a town five miles away. people in the telegraph office could hear voices on the telephone. the next day, bell strung a telephone wire across six miles. the message sent over the telephone wire could be heard clearly. this showed that the telephone worked over long distances. bells invention became popular very quickly. by 1886, 150,000 people in the united states owned a telephone. alexander bell continued to invent for the rest of his life. which detail from the image would be most important to include in a summary of the passage? a. bell invented the telephone by experimenting with the multi - reed system and with thomas watsons help. his invention quickly became popular. b. alexander graham bell won a united states patent for the telephone in 1876. c. the telephone was one of the most important discoveries of alexander graham bell. d. bell and thomas watson discovered that only one reed was needed to make sounds.

Explanation:

The passage focuses on Alexander Graham Bell inventing the telephone, his experimentation process, and obtaining a patent. It also mentions Watson's assistance. Option A best captures the main - idea as it includes Bell's invention, experimentation, and popularity. Option B only mentions the patent, option C is about the discovery of the multi - reed system which is a part of the process, and option D is about a discovery related to making sounds which is also a partial aspect.

Answer:

A. Bell invented the telephone by experimenting with the multi - reed system and with Thomas Watson's help. His invention quickly became popular.