To solve expressions like the one above, you must first complete the operations inside the parenthesis. We know this because of PEMDAS, wherein the P (representing parenthesis) comes first.
(14 - 6) * (2+4) = (8) * (6)
Next, we must simplify the expression. There is only one operation left to complete, multiplication, so that is what we are going to do next.
8 * 6 = 48
Therefore, your answer is B. 48
I hope this helps! :)