The fraction being a negative, the answer would be towards the negative side of the number line. Based off the options, C would be the logical answer.
But to be safe, you would divide negative six by seven( -6/7 ) which gives the number -0.857142857 with 142857 repeating.
If rounded the closest number would be -1 ( -0.85 to the nearest whole number -1 ), Number line C shows closest to negative one.