If the overnight temperature at the Arctic Circle was -14°F, but the temperature rose to 8°F during the day, what was the difference between these high and low temperatures?

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.

Not sure what the question is?