Hey there :)
[tex]\boxed{ (\frac{4}{5})^6 } [/tex]
This means the power goes on both the numerator and the denominator
[tex]\boxed{ (\frac{4^6}{5^6} ) } [/tex]
When solved:
[tex]\boxed { \frac{4096}{15645} }[/tex]
Your answer will be [tex]\boxed{option\ B}[/tex]