Answer:
The answer to your question is the letter d) ∛ab²
Explanation:
Data
 a¹/³ b²/³
Process
A fractional exponent is converted into a radical form, to do this change, the numerator will be the exponent of the base and the denominator will be the root of the base.
then
 a¹/³ = ∛a
 b²/³ = ∛b²
but both terms have the same root so let's write them in the same cubic root.
  ∛ab²