[单选题]
On a day when the speed o8/u7lh,+si(b xqx wm 7z 7jgqcf sound in air isyb/ z*s5g6w,d wb*pel 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far awaysz/6l*5,wgby*epw db was the object that reflected back the sound?
A. $4.25 \; m$
B. $8.50 \; m$
C. $0.425 \; m$
D. $0.850 \; m$
