If \(\frac{{(\sin \;\theta - {\rm{cosec}} \ \theta )\;(\cos \theta - \sec \theta )}}{{{{\tan }^2}\;\theta - {{\sin }^2}\;\theta }} = \;{r^3}\), then r = ?

• A. cosec θ sec θ
• B. cot θ
• C. tan θ
• D. sin θ cos θ