Could you please help answer these questions? Thank you

O d. 2 donuts. QUESTION 11 If an economy is producing efficiently, then O a. it is possible to produce more of one good without producing less of another good. O b. there is no way to produce more of one good without producing less of another good. O c. it is not possible to produce more of any good at any cost. O d. it is possible to produce more of both goods without increasing the quantities of inputs that are being used. QUESTION 12 The production possibilities frontier is used to illustrate some basic economic ideas, including O a. scarcity. O b. opportunity cost. O c. economic growth. O d. All of the above are correct. QUESTION 13 The opportunity cost of obtaining more of one good is shown on the production possibilities frontier as the O a. amount of the other good that must be given up. b. number of dollars that must be spent to produce it. O c. amount of resources that must be devoted to its production. O d. market price of the additional amount produced