[单选题]
On a day when the spafw5y)n u2cb-ye.;rm eedhs4a++ j emez. of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the objee 4zjesh m++.act that reflected back the sound?
A. $4.25 \; m$
B. $8.50 \; m$
C. $0.425 \; m$
D. $0.850 \; m$
