11. Which of the following is equal to $\frac{3^{9}}{9^{3}}$ ?
A 3
B 9
C 27
D 81
E 243
11. $\mathbf{C}$ The fraction $\frac{3^{9}}{9^{3}}=\frac{3^{9}}{\left(3^{2}\right)^{3}}=\frac{3^{9}}{3^{6}}=3^{3}=27$.