(2g⁵)³ / (4h²)³
Since power ³ is outside parenthesis, you should put the power to each expression inside parenthesis as below
2³(g⁵)³ / 4³(h²)³
in the multiplication of exponents, you add the indices
8(g⁵⁺³) / 64(h²⁺³)
8g⁸ / 64h⁵
it simplifies into
1g⁸ / 8h⁵
Your answer is D) g⁸ / 8h⁵