15. As we tune to our favorite radio station, several events happen as listed below.
1. Amplifier circuit strengthens the received signal
2. The loudspeaker converts demodulate signal back to sound waves
3. The radio's tuner circuit selects the frequency received from the antenna
4. The demodulator removes carrier waves leaving only the original electrical audio signal

What could be the correct order of these events?
A 1-3-4-2
B. 3-1-4-2
C. 2-3-4-1
D. 4-1-2-3​