The correct choice is:
The line with a slope of 5 is the steepest, because the absolute value of 5 is larger than the absolute values of 2 and -4.
In terms of steepness, a greater absolute value of the slope indicates a steeper line, regardless of the sign. The absolute value of 5 (which is 5) is greater than the absolute values of 2 (which is 2) and -4 (which is 4), making the line with a slope of 5 the steepest.