Consider the figure at the right, which represents the production possibilities boundary for pizzas and guns. The combination(s) of pizzas and guns at O A. points A and C are just attainable but inefficient. A O B. points A and C are less efficient than point B. O C. points A and C are unattainable. O D. point B is efficient but unattainable. Quantity of Pizza O E. point B is attainable but inefficient. B C Quantity of Guns