E4E11

What could be the cause of local AM broadcast band signals combining to generate spurious signals on the MF or HF bands?

1. AOne or more of the broadcast stations is transmitting an over-modulated signal
2. BNearby corroded metal connections are mixing and reradiating the broadcast signals
3. CYou are receiving skywave signals from a distant station
4. DYour station receiver IF amplifier stage is overloaded

Pick an answer to check it.