[单选题]
A 200-L electric water heater uses b b2 7b n58tg;,csfwjk2 k2og q*xyw-ssc 5 i*o/pW. Assuming no heat loss, how long would it take to heat water in this tank from-gsw*ps c/2xi5y q oo* $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?
A. $5 \; hours$
B. $6 \; hours$
C. $7 \; hours$
D. $8 \; hours$
