In Problem 1, Charlie Has the Utility Function U(x_A, X_B)

In Problem 1, Charlie has the utility function U(x_A, x_B) = x_Ax_B. His indifference curve passing through 40 apples and 9 bananas will also pass through the point where he consumes 5 apples and

A) 48 bananas.
B) 77 bananas.
C) 80 bananas.
D) 24 bananas.
E) 72 bananas.