The value of \(\;\left( {5\frac{1}{{4\;}} \div \;\frac{{3\;}}{7}of\;\frac{1}{2}} \right) \div \left( {5\frac{1}{9} - 7\frac{7}{{8\;}} \div \;9\frac{9}{{20}}} \right) \times \frac{{11}}{{21}} - \left( {5 \div 2\;of\frac{1}{2}} \right)\)is:

• A. \(\frac{35}{24}\)
• B. \(\frac{15}{28}\)
• C. -2
• D. 8