The value of : \(\left[\dfrac{5}{7} \ \text{of} \ 1 \dfrac{3}{8} - \dfrac{5}{8} \ \text{of} \ \dfrac{6}{7}\right] \div \left[1- \dfrac{1}{7} \times \left(\dfrac{5}{12}+\dfrac{1}{3}\right)\right] \times \dfrac{\dfrac{1}{7}-\dfrac{1}{9}}{\dfrac{1}{7}+\dfrac{1}{9}}\)

• A. \(\frac{1}{4}\)
• B. 8
• C. 4
• D. \(\frac{1}{16}\)