B. False
1) Since in this expression:
[tex]\sqrt[]{5x}[/tex]
2) To remove that x, from the root and rewrite it as a factor, like this:
[tex]\sqrt[]{5x^2}=x\sqrt[]{5}[/tex]
Since this is not the case, then the answer is False, therefore:
[tex]\sqrt[]{5x}\ne x\sqrt[]{5}[/tex]
And the answer is FALSE
