Answer: OPTION B.
Step-by-step explanation:
The number that are inside of the square root are called "radicands".
To subtract the expressions shown in the image attached, the radicands must be the same.
As you can see, both are equal, therefore, you can subtract the numbers that are in front of the square roots.
Then, you obtain the following result:
[tex]3\sqrt{2}-\sqrt{2}=(3-1)\sqrt{2}=2\sqrt{2}[/tex]
The answer is the option B.
