[单选题]
A train is traveling toward yo; yyu.w ndk42pu at 120 km/h. T)/4okmv-zd v xvcl9y )he train blows its 400-Hz whistle. Take the speed of)d/l4x9v- vmz kc)v yo sound to be 340 m/s. What frequency do you hear?
A. $444 \; Hz$
B. $439 \; Hz$
C. $364 \; Hz$
D. $361 \; Hz$
