which expression is equivalent to the pic

Answer:
OPTION A: [tex]$ \frac{1}{2^{15}} $[/tex]
Step-by-step explanation:
We should know that:
[tex]$ (a^b)^c = a^{b . c} $[/tex]
So, [tex]$ (2^3)^{-5} = 2^{3 . (-5)}} $[/tex]
[tex]$ = 2^{-15} $[/tex]
This is equivalent to [tex]$ \frac{1}{2^{15}} $[/tex]
Hence, OPTION A is the answer.