Ok, I carefully checked the CO2 data and I agree that actual emissions are above scenario A. But looking at the other gases, clearly they have not followed scenario A:
If you look at the total climate forcing of these gases and lay a straight line on the slope of the curve in 1985 and project it forward, clearly forcing has been growing at a sublinear rate since the paper was published, which would put us some where between scenario B and C.
http://www.esrl.noaa.gov/gmd/aggi/
You can't just look at CO2 alone.