Charlie Consumes Apples and Bananas $\mathbf{U}\left(X_{A}, X_{B}\right)=x_{A} x^{2} B$

Charlie consumes apples and bananas. His utility function is $\mathbf{U}\left(X_{A}, X_{B}\right) =x_{A} x^{2} B$
-refer to scenario above, Charlie's utility function is x_Ax_B.The price of apples used to be $1, the price of bananas used to be $2, and his income used to be $40.If the price of apples increased to $6 and the price of bananas stayed constant, the substitution effect on Charlie's apple consumption would reduce his consumption by

A) 8.33 apples.
B) 13.33 apples.
C) 5 apples.
D) 16.67 apples.
E) None of the above.