please give opinion on most correct answer and why

What effect does a tax on buyers of coffee have on the equilibrium price (for buyers) and quantity? Select one: O a. It reduces the equilibrium price of coffee and reduces the equilibrium quantity. b. It increases the equilibrium price of coffee and reduces the equilibrium quantity. O c. It increases the equilibrium price of coffee and increases the equilibrium quantity. O d. It reduces the equilibrium price of coffee and increases the equilibrium quantity