A device mounted on a communication satellite which receives, amplifies and re-transmits signals from earth station is

The other options are incorrect.

• A track is a path that a satellite follows in orbit around Earth.
• A transistor is a semiconductor device that can be used to amplify or switch electronic signals and electrical power.
• A terminal is a device that is used to connect to a computer or other network.
• None of the above is a device that receives, amplifies and re-transmits signals from earth station.