An amateur station located on the surface of the Earth for communication with other Earth stations by means of Earth satellites
An amateur station that transmits communications to initiate, modify, or terminate functions of a space station✓Correct answer
An amateur station located in a satellite or a balloon more than 50 kilometers above the surface of the Earth
An amateur station that receives telemetry from a satellite or balloon more than 50 kilometers above the surface of the Earth
Explanation
A space telecommand station is one that transmits communications to initiate, modify or terminate the functions of a space station. The option about communicating through satellites from the surface of the Earth describes an Earth station, and the choices built around 50 kilometers describe a space station and a receiving station rather than a telecommand station.