If demand and supply both increase, which of the following will definitely occur? A. The equilibrium price will increase. O B. The equilibrium quantity will decrease. O C. The equilibrium price will decrease. O D. The equilibrium quantity will increase. If demand decreases and supply increases, which of the following will definitely occur? O A. The equilibrium quantity will decrease. O B. The equilibrium price will increase. O C. The equilibrium price will decrease. O D. The equilibrium quantity will increase