At the Point Where the Demand and Supply Curves for a Product

At the point where the demand and supply curves for a product intersect,

A) the selling price and the buying price need not be equal.
B) the market may, or may not, be in equilibrium.
C) either a shortage or a surplus of the product might exist, depending on the degree of competition.
D) the quantity that consumers want to purchase and the amount producers choose to sell are the same.