Every Time You Go to the Grocery Store,you Try to Choose

Multiple Choice

Every time you go to the grocery store,you try to choose the shortest line.But all of the lines always seem to be the same length.Why?

A) Everyone else is trying to choose the shortest line,too.
B) The store manager tells the cashiers to speed up or slow down to maintain equal line lengths.
C) The union tells the cashiers to speed up or slow down to maintain equal line lengths.
D) The cashiers all work at the same speed.
E) The cashiers do not have an incentive to work faster,