Please help I sont get it

Answer:
D. [tex]\frac{1}{3^{8}}[/tex]
Step-by-step explanation:
When you have this type of exponents, you need to multiply them. If we had something like 3^1 * 3^1, we would add the exponents, but these must multiply.
[tex](3^{-2})^{4}[/tex] 2*-4 = -8.
[tex]3^{-8}[/tex]
When we have negative exponents, we put the [tex]3^{8}[/tex] in the denominator:
[tex]\frac{1}{3^{8}}[/tex] is the answer.