My son not understanding any of this. Can anyways help

Answer:
The answer here could possibly be D. (8×1/2)1/3
Step-by-step explanation:
Overall, what the associative property is is moving the parenthesis elsewhere. You just group two different numbers of the equation.
The equation that makes the original equation much easier to evaluate is D. (8×1/2)1/3, since 8×1/2 is 4 and now you just multiply 4 with 1/3.