I think it's universally accepted that number lines run from negative to positive, going left to right, correct? Seems like a dumb question but I'm not sure if ETS suspects that we'll simply assume that.

BUT assuming that it's a traditional number line--horizontal, positive numbers to right side of zero and negative to the left--I think the answer here has to be A.

I) Given q=-s, q will always be negative s, i.e. q=-4 when s=4, q=-2.5 when s=2.5 and so forth. r is somewhere in between, and thus closest to zero. I) is sufficient.

II) Given -t<q, q will always be larger than the negative counterpart of t. So if t=5, q must be greater than -5. If t=1.23, q must be greater than -1.23. But we don't know how much greater. If -t=-2, q could be 1, in which case r is not closest to zero. II) is not sufficient.

I will go with A