Assume that Andia and Zardia can switch between producing wheat and producing beef at a constant rate. Andia needs 20 minutes to Make 1 Bushel of Wheat and 10 minutes to make a Pound of Beef. Zardia needs 15 minutes to Make 1 Bushel of Wheat and 5 minutes to make a Pound of Beef. Which of the following combinations of wheat and beef could Zardia not produce in one 10-hour day? Select one: O a. 18 bushels of wheat and 30 pounds of beef b. Zardia can produce any of the above combinations of wheat and beef c. 20 bushels of wheat and 15 pounds of beef d. 10 bushels of wheat and 25 pounds of beef e. 25 bushels of wheat and 5 pounds of beef