[单选题]
An object slides downs,1qnery2 lb:hv7h ;l a frictionl muvt*p-qmu03du8a n 3.dm kcc02b 3itess inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the v 8undcm-v3bm pm.d u3 aiq 3kut0ct02*ertical height of the plane?
A. $19.6 \; m$
B. $9.80 \; m$
C. $4.90 \; m$
D. $2.45 \; m$