Help, I am confused although I think this is simple

Answer:
A) 8
Step-by-step explanation:
Factor the number: 512=[tex]8^{3}[/tex]
= [tex]\sqrt[3]{8^{3} }[/tex]
Apply the radical rule: [tex]\sqrt[n]{a^{n} }[/tex] = a, a[tex]\geq[/tex]0
You get your answer: 8