The greatest negative integer
A. -100
B. Does not exist.
C. -1
D. -9

Hint: In this question it is given that we have to find the greatest negative integer. So to find the answer we need to first understand the number line.


Complete step-by-step answer:
In the above number line if we move from left to right the numbers get larger. Negative numbers lie on the left side of zero in a number line and the positive numbers are on the right side of zero.
So we can write these negative numbers as,
………< -7<-6<-5<-4<-3<-2<-1
After -1 we get another integer 0 which is greater than -1 but 0 is not a negative integer, so by this we can easily say that -1 is the greatest negative integer.
So the correct option is option C.

Note: Negative integers functions reversed than positive integers, like- as we know that 7 is greater than 6 so for negative we have to say that -6 is greater than -7, so this way also we can find that -1 is the greatest negative integer amongst the others.