$A$ rocket is moving away from the Earth at a speed of $0.2c$,where $c$ is the speed of light. It emits a signal of frequency $4 \times 10^7 \text{ Hz}$. What will be the frequency observed by an observer on the Earth?
- A$4 \times 10^6 \text{ Hz}$
- B$3.2 \times 10^7 \text{ Hz}$
- C$3 \times 10^6 \text{ Hz}$
- D$5 \times 10^7 \text{ Hz}$
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