-2.4 < -2.40
This is false because they are equal to each other/they are the same number. So -2.4 can't be less than -2.40.
-2.4 ≠ -2.40
This is false because they are equal to each other, as they are the same number.
-2.4 ≤ -2.40
This is true because -2.4 is equal to -2.40
-2.4 > -2.40
This is false because they are the same number, so -2.40 can't be less than -2.4.
The third choice is your answer.