[单选题]
A 200-L electric water heater uses 2 kW. h2wy -zrk tzdhd*-bchl 57/5z h z1d,p6) g9p1 udyv gjg5ac5zAssuming no heat loss, how long would it take to heat w cv)dj,9gd6upy hgzzp5 15g1aater in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?
A. $5 \; hours$
B. $6 \; hours$
C. $7 \; hours$
D. $8 \; hours$
