[单选题]
You drop a stone into a deep well and ova y-jw m rp7li+4jiu1c54p)hear aky ssi3b)b*+t4d/uz7svc v 2the splash 2.5 s later. How deep is +2 /stsi* dcus7a3z vkvy b)4bthe well? (Ignore air resistance, and assume the velocity of sound is 340 m/s.)
A. $25 \; m$
B. $27 \; m$
C. $29 \; m$
D. $31 \; m$
