Charlie Has the Utility Function U(x_A, X_B)=x_Ax_B

Charlie has the utility function U(x_A, x_B) =x_Ax_B.His indifference curve passing through 15 apples and 16 bananas will also pass through the point where he consumes 3 apples and

A) 40 bananas.
B) 83 bananas.
C) 20 bananas.
D) 87 bananas.
E) 80 bananas.