The first step for solving this expression is to simplify the radical in the first set of parenthesis.
(6

) × (3

)
Simplify the radical in the second set of parenthesis.
(6

) × (12

)
Remove the parenthesis off of both sets.
6

× 12

Now calculate thee product to find your final answer.
72

This means that the correct answer to your question is going to be 72

,, or option B.
Let me know if you have any further questions.
:)