At the Market-Clearing Price for a Commodity

At the market-clearing price for a commodity,

A) prices will remain unchanged,even if there is excess demand.
B) there may be excess demand for a product but not excess supply.
C) shifts in the supply or demand curves will not cause price changes.
D) the quantity supplied of the commodity equals quantity demanded.
E) there will never again be any pressure for prices to change,independent of what happens to demand or supply.