It Is Halloween,but You Don't Want to Be Running Back

It is Halloween,but you don't want to be running back and forth to answer the door.To avoid any "tricks," you decide to leave a large container of candy on the porch.You've just read Chapter 5 and you have a hunch about how to keep greedy trick-or-treaters from taking more than their fair share of the candy.You decide to

A) set up a tape-recorder of Barney the Dinosaur singing "I love you, you love me...."
B) install a one-way mirror to catch and punish offenders, and to make an example of them.
C) place a large mirror behind the candy, so that children can see themselves as they approach.
D) place a picture of the Wicked Witch of the West behind the candy, to warn them what will happen if they take too much.
E) place a sign beside the candy politely asking each trick-or-treater to have only one piece of candy.