[单选题]
When a liquid freezeqyw0u n9/bmb w+sm c/;ig79rq;pri;y+0+ +nbamvhp2r1r- x w+m;i,gnha2cvq9oc os s
A. the temperature of the substance increases.
B. the temperature of the substance decreases.
C. heat energy leaves the substance.
D. heat energy enters the substance.
