RECTION A Change the most appropriate answer went to each number in your online anew 1 Study the diagram a possible A Food output 5 10 15 20 25 30 Film output This production possibilities frontier is concave to the origin because a) resources are equally substitutable between the production of food and films bj society can have more food only if it produces more films c) the cost of food in terms of films is constant d) the opportunity cost of food in terms of films increases and more films are produced