A buzzer that produces sound with frequency $846\ \text{Hz}$ is fixed to a string and whirled in a horizontal circle. Its linear speed is $25.0\ \text{m s}^{-1}$. The speed of sound is $340\ \text{m s}^{-1}$. What is the maximum frequency heard by the observer?
- A$783\ \text{Hz}$
- B$788\ \text{Hz}$
- C$908\ \text{Hz}$
- D$913\ \text{Hz}$