Geometry

The correct answer is: C. 8 units.

1. Recall the formula for finding the distance between two points on a number line:

If we have two points  and  on a number line, the distance  between them is given by .

From the number - line, the coordinate of point  is  and the coordinate of point  is .

2. Calculate the length of :

Using the distance formula , where  and , we have

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