Microeconomics Help! (ECO/365T)

In the following question you are asked to determine, other things equal, the effects of a given change in a determinant of demand or supply for product X upon (1) the demand (D) for, or supply (S) of, X; (2) the equilibrium price (P) of X; and (3) the equilibrium quantity (Q) of X. A decrease in the price of a product that is a close substitute for X will Multiple Choice (ithink decrease D, decrease P, and decrease Q. O decrease S, increase P, and increase