Suppose the Market for Cookies Is Initially in Equilibrium

Suppose the market for cookies is initially in equilibrium. For a given upward-sloping supply curve, other things being equal, the equilibrium price and equilibrium quantity of cookies is most likely to decline when _____

A) the price of milk, a complement, increases.
B) consumer income increases.
C) the number of consumers increases.
D) the price of coffee, a complement, decreases.
E) price of crackers, a substitute, increases.