The value of \(\left(\dfrac{8\dfrac{1}{4}-5\dfrac{7}{8}}{3\dfrac{3}{4}\ \rm{of} \:1\dfrac{1}{3}} \div\dfrac{6\dfrac{1}{4}\ \rm{of} \ 9\dfrac{1}{2}}{\dfrac{19}{20}}\right) \times33\dfrac{1}{3}\ \rm{of} \ \:\dfrac{8\div\dfrac{4}{5}\ \rm{of} \ \:\dfrac{2}{3}}{8\times\dfrac{2}{3}\div\dfrac{4}{5}}\) is
1. \(\dfrac{5}{9}\)
2. \(\dfrac{1}{9}\)
3. \(\dfrac{9}{16}\)
4. \(\dfrac{9}{32}\)