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A cube's surface is made of 6 squares, (you can count it there are 6 faces :) ). A square's surface area is    x is length of one edge. So we will multiply  by 6 to find the total surface area. The x is given 8, let's plug it in the formula.



Answer is C

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.