Question Pool -- Category E3B

What is the typical reason for hearing an echo on the received signal of a station in Europe while directing your HF antenna toward the station?
A.
The station's transmitter has poor frequency stability
B.
The station's transmitter is producing spurious emissions
C.
Auroral conditions are causing a direct and a long-path reflected signal to be received
D.
There are two signals being received, one from the most direct path and one from long-path propagation

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