You Are Asked to Determine, Other Things Equal, the Effects

You are asked to determine, other things equal, the effects of a given change in a determinant of demand or supply for product Xupon (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.Refer to the above.An increase in the price of a product which is a close substitute for X will:

A) decrease D, increase P, and decrease Q.
B) increase D, increase P, and decrease Q.
C) increase D, increase P, and increase Q.
D) increase D, decrease P, and increase Q.