AMC8 1987 Problem 12

Past Contests AMC8 AMC 8 - 1987
1

What fraction of the large 12 by 18 rectangular region is shaded?
Image
Answer Choices
A. \dfrac{1}{108}
B. \dfrac{1}{18}
C. \dfrac{1}{12}
D. \dfrac{2}{9}
E. \dfrac{1}{3}