问题详情

Today jack-o-lanterns in the windows of a house on Halloween night let costumed children know that______.

A．they can buy pumpkin pies there

B．the hosts wouldn"t like to be bothered

C．knocking and saying "Trick or Treat!"will make the host give candies

D．there is nobody in the house

请帮忙给出正确答案和分析，谢谢！