The correct option is C -7 < -6 < 4
In -8< -9 < 10:
As -8 is greater than -9, we can say that this is an incorrect option.
In -9 < -12 < 12:
As -9 is greater than -12, we can say that this is an incorrect option.
In -7< -6 < 4:
As -7 < -6 and -6 < 4, we can say that this is the correct option.
In -7 < -13 < 4
As -7 > -13, we can say that option D is incorrect.