[单选题]
On a day when the speedi;czbtg z23(ah53krc cq8m :t of sw-a0*ml:t vvl ound in air is 340 m/s, a bat emits a shriek whose echo reaches it vw :avmtl-*0l 0.0250 s later. How far away was the object that reflected back the sound?
A. $4.25 \; m$
B. $8.50 \; m$
C. $0.425 \; m$
D. $0.850 \; m$
