The image below shows a coherer from the 1890s, the first type of device able to receive radio waves. When a radio signal was received by the coherer, the small metal pieces inside would cling together and allow a current to pass through. The current would trigger a bell or a pen attached to a paper strip which would make a record of the signal. Why was the coherer an important piece of technology? A. It led to the development of other devices that used wave technology. B. It allowed people to send images long distances. C. It led directly to devices like computers.