Why does an AM receiver or pick-up sign despite the far distance from the transmitter compared to the FM receiver?

• A. The Am receiver picks up signal easily because of the transistor
• B. The Am receiver picks up signal easily because the signal transmitted by Am transmitted is by means of line to sight.
• C. The Am receiver picks up signal easily because the transmitted by Am transmitter is by means of line to ground
• D. The Am receiver picks up signal easily because the signals transmitted by Am transmitter is by means of the line to sight