Given that Andia and Zardia can switch between producing wheat and producing beef at a constant rate.
Assume that Andia and Zardia each has 60 minutes available.  If each person spends all his time producing the good in which he has a comparative advantage, then total production is ______.
A、3 bushels of wheat and 6 pounds of beef
B、3.5 bushels of wheat and 5.5 pounds of beef
C、4 bushels of wheat and 5 pounds of beef
D、7 bushels of wheat and 11 pounds of beef