In the Classroom Experiment Where a Mug Is Bought and Sold

In the classroom experiment where a mug is bought and sold,

A) those who possessed a mug where willing to sell it for less than the price that those who did not have a mug were willing to offer.
B) those who possessed a mug where willing to sell it for more than the price that those who did not have a mug were willing to offer.
C) the price that students were willing to pay to obtain a mug eventually coincided precisely with the price required by those who possessed a mug and were willing to sell it.
D) the price of a mug appeared to have no correlation with whether a student owned a mug or not.