According to this passage, which factor influenced the Roman way of communication most?

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问题 According to this passage, which factor influenced the Roman way of communication most?
  
In this high-tech digital world, it is very convenient for us to send messages. But in ancient times, people had to think hard to find ways to get the message sent.
   Roman soldiers in some places built long rows of signal towers. When they had a message to send, the soldiers shouted it from tower to tower. If there were enough towers and enough soldiers with loud voices, important news could be sent quickly over distance.
   In Africa, people learned to send messages by beating on a series of large drums. Each drum was kept within hearing distance of the next one. The drum beats were sent out in a special way that all the drummers understood. Though the messages were simple, they could be sent at great speed for hundreds of miles.
   In the eighteenth century, a French engineer found a new way to send short messages. In this way, a person held a flag in each hand and the arms were moved to various positions representing different letters of the alphabet. It was like spelling out words with flags and arms.
   Over a long period of time, people sent messages by all these different ways. However, not until the telephone was invented in America in the nineteenth century could people send speech sounds over a great distance in just a few seconds.

选项 A、It could send speech sounds.
B、It could send complicated messages.
C、It could be understood by any French person.
D、It could carry messages over a long distance in just a few seconds.

答案B

解析 法国人可以用旗子传递字母,所以可以推测它可以传递复杂信息。A错,因为法国的信
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