ANSWER
[tex]3x(5x^2-6x+3)[/tex]EXPLANATION
We want to identify the option that is completely factored.
For an expression to be completely factored, it means that there are no more common terms between the terms in the expression.
That means it can not be factored any further.
Therefore, the only correct option is:
[tex]3x(5x^2-6x+3)[/tex]