Shen fills a beaker with 1000ml of room-temperature water and then adds one ice cube. The ice cube begins to slowly melt. After 5 minutes the ice cube has completely melted and is no longer visible. Which of the following is true of the liquid water after Shen added the ice cube to it?
A.It gains heat energy.
B.It loses heat energy.
C.Its heat energy does not change.
D.Its heat energy increases and then decreases.