[单选题]
What is the frequency hea5n.wjcm:g : yyrd by a stationary observer when a trc -v. ,)pnmr)su:dzpdain approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/sun:p)d zd cmpr),.v-s.
A. $551 \; Hz$
B. $600 \; Hz$
C. $653 \; Hz$
D. $658 \; Hz$
