In the EOQ Model,if No Quantity Discounts Are Allowed,then ______

In the EOQ model,if no quantity discounts are allowed,then ______.

A) the unit purchase price of the materials is constant because it is unaffected by the quantity ordered
B) the unit purchase price of the materials varies according to the quantity ordered
C) the unit purchase price of the materials varies according to the quality of the materials
D) the unit purchase price of the materials varies depending on the period when materials are ordered