Please help me, I don't understand. Thank you

(444360/quizzes/1099511/take Question 18 1 pts The number of firms producing cement increases. As a result, the equilibrium price of cement and the equilibrium quantity _ _ _-. O rises; increases rises; decreases falls; decreases O falls; increases O does not change; increases Question 19 1 pts If a monopoly produces the quantity where MR = MC, then the firm is producing the quantity that i. maximizes its profit ii. is allocationly efficient. O Only i is correct. O Only ii is correct. O Both i and ii are correct. O Neither i nor ii is correct