Someone plss help me with A, B, and C.​

I Think The answer is b I hope it helps My friend Message Me if I’m wrong and I’ll change My answer and fix it for you

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.

It would be 18 cm