Suppose a Medical Study Reveals New Benefits to Consuming Beef

Suppose a medical study reveals new benefits to consuming beef and at the same time a bumper corn crop reduces the cost of feeding cows. The equilibrium quantity of beef will

A) stay the same.
B) increase.
C) definitely either stay the same or decrease.
D) decrease.
E) perhaps increase, decrease or stay the same, but more information is needed to determine which it will do.