Ok, you're dealing with a 1 dimensional number line.
To find the distance between these two points what you want to do is go from -3428 to 0, then from 0 to 286.
The distance between -3428 and 0 is 3428. The distance from 0 to 286 is 286.
Add up both these differences:
3428 + 286 = 3714
So the answer is in fact D, 3714.
