Answer:
C
Step-by-step explanation:
A radical can be expressed as a fraction exponent. The index of the radical is the denominator of the fraction. The numerator of the fraction is the exponent of the base.
Here the base is 8. It is a cube root and so the index is 3. This means the fractional exponent will be a fraction with denominator 3. It's exponent is x and this is the numerator.
[tex]\sqrt[3]{8^x}=8^\frac{x}{3}[/tex]
