AMC 8 1990 Problem 3

What fraction of the square is shaded?

$\text{(A)}\ \frac{1}{3} \text{(B)}\ \frac{2}{5} \text{(C)}\ \frac{5}{12} \text{(D)}\ \frac{3}{7} \text{(E)}\ \frac{1}{2}$