Answer :

crisforp
5 ^ ( - 8 - 4 ) = 5 ^ ( - 12 ) D.
[tex]Use:a^n\cdot a^m=a^{n+m}\\\\5^{-8}\cdot5^{-4}=5^{-8+(-4)}=5^{-12}\\\\Answer:\boxed{D}[/tex]

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