What is a possible value of x?
A. 3 cm
B. 4 cm
C. 5 cm
D. 6 cm

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.

The answer of the above is