AMC 8 1992 Problem 2

Which of the following is not equal to $\dfrac{5}{4}$? $\text{(A)}\ \dfrac{10}{8} \text{(B)}\ 1\dfrac{1}{4} \text{(C)}\ 1\dfrac{3}{12} \text{(D)}\ 1\dfrac{1}{5} \text{(E)}\ 1\dfrac{10}{40}$