Solution:
A is the correct option.
Step-by-step explanation:
We have to find the cube root of

In order to find the cube root of the expression, we find the factors of 27.

Also x^18 can be written as

Replace the given expression with these values, we get
![\sqrt[3]{27x^(18)} =\sqrt[3]{3^3 \cdot (x^6)^3 }](https://img.qammunity.org/2019/formulas/mathematics/high-school/r4n10ftigrmd74i1y4i2lxf0d126za81n8.png)
Now, we have the formula,
![\sqrt[n]{x^n} =x](https://img.qammunity.org/2019/formulas/mathematics/high-school/cflif5oqn0pr9m6uagp0epj4j1jwbocrvj.png)
Using this formula, the cube with the cube root got cancelled and we are left with
![\sqrt[3]{27x^(18)} = 3\cdot x^6](https://img.qammunity.org/2019/formulas/mathematics/high-school/142f6svibuixuokfdenmvxhplzp0ow4e0v.png)
Therefore, the cube root of 27x^18 is 3x^6.
A is the correct option.