A dolphin moves at a speed of $16.0\,\text{m s}^{-1}$ straight towards a stationary underwater microphone. The dolphin produces sound with a frequency of $122\,\text{kHz}$. The speed of sound in water is $1480\,\text{m s}^{-1}$. What frequency of sound is detected by the microphone?
- A$1300\,\text{Hz}$
- B$1330\,\text{Hz}$
- C$121\,\text{kHz}$
- D$123\,\text{kHz}$