选择恰当的答语( )
A:Of course, I can.
B:Because it's interesting.
C:I bought it yesterday.
小明同学参加“献爱心”活动,买了2元一注的爱心福利彩票5注,则“小明中奖”的事件为 ____事件(填“必然”或“不可能”或“随机”).