[单选题]
On a day when the speed of srf 8 gy j62vopbz0jm+6s8cet7-d i u)noun dv5huu 0lj.3: e:brjpd in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 sru 5hv3j0ebu p j:ld.: 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. $0.850 \; m$
