question_answer

\[\frac{{{\mathbf{4}}^{\mathbf{-}}}^{\mathbf{3}}\mathbf{\times }{{\mathbf{a}}^{\mathbf{-}}}^{\mathbf{5}}\mathbf{\times }{{\mathbf{b}}^{\mathbf{4}}}}{{{\mathbf{4}}^{\mathbf{-}}}^{5}\mathbf{\times }{{\mathbf{a}}^{\mathbf{-}}}^{8}\mathbf{\times }{{\mathbf{b}}^{3}}}=\]

A)  \[\frac{16{{a}^{3}}}{{{b}^{7}}}\]  

B)  \[8\frac{{{a}^{2}}}{{{b}^{-7}}}\]          

C)  \[2\frac{{{a}^{-13}}}{{{b}^{-7}}}\]                         

D)  \[\frac{{{a}^{8}}}{{{b}^{-1}}}\]