[单选题]
A 5000-W heater is used to h lm bha8,3/cugeat water. x)tfvybzb*::.u,e +s wtoxx*How long will it take to heat 20 kg of water vfxub)eb:szotx. *x wy*,t: +from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?
A. 2 minutes
B. 12 minutes
C. 22 minutes
D. 32 minutes
