The correct answer is D) satellites.
The device that made possible TV stations such as CNN were satellites.
Satellites changed the way humans communicated and represented an enormous advancement in broadcasting systems. Using a transponder, satellites amplify radio telecommunications communications signals. Signal transmission is very rapid although sometimes it can have interference due to wheater conditions. The quality of the signals sent by satellites is very good and net. Satellites transmission are used in radio, television, internet, telephone, and of course, for military purposes. Yes, it's true that the device that made possible TV stations such as CNN were satellites.