BUYYY MY N-I-GGAS FU-CK THIS ACC

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.

2160ft^3 i think you could use a formala to you out with this in the future