Which comparison is not correct?

a. 6 > 5

B. - 7 > - 9

C. - 3 < 4

D. - 4 < - 12

-4 < - 12 would be my answer, just from looking at it. If you write it out on a number line, the number - 4 is higher than - 12. The higher the negative number, the lower it is on the line. So, - 4 is greater than - 12, not lower than.