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Edit: It is A, because it says they are DIFFERENT numbers on the numberline.

The only way their distance from the 0 can be the same is if they are the same numbers, or if they are opposites. Since it tells us they are different numbers, s=-t, and therefore s+ t=0

There is only one case where the s and t are equidistant from 0. That means one of them is positive and another one is negative. This satisfies s+t = 0