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Answer :

We will find the equivalent expression as follows:

[tex]\frac{a^3b^5}{a^4b}=a^3a^{-4}b^5b^{-1}=a^{(3-4)}b^{(5-1)}[/tex][tex]=a^{-1}b^4=\frac{b^4}{a}[/tex]

So, the solution is b^4 / a. [Opion A]