If 5 sin x = 4, then the numerical value of \(\left( {\frac{{\tan x - \cot x}}{{\sec x - \tan x}}} \right)\left( {\frac{{{{\cos }^4}x - {{\sin }^4}x}}{{2{{\cos }^2}x - 1}}} \right)?\)

• A. \(\frac{3}{5}\)
• B. \(\frac{5}{4}\)
• C. \(\frac{7}{4}\)
• D. \(\frac{9}{5}\)