The advantage of a synchronous orbit is that the satellite can: fly over the entire earth transmit over the entire earth receive continuous signals from a ground transmitter all of the above

receive continuous signals from a ground transmitter

Explanation:

Remember a synchronous orbit is synchronous in the sense that it has equal rotational period to the body orbiting having the same direction of rotation as that body. An example of this is the Moon and the planet earth.

Thus it allows continuous signals to be sent from a ground transmitter and received by a space object.