Scientists look at climate model predictions and compare them with actual recorded observations, cli

2.   Scientists look at climate model predictions and compare them with actual
recorded observations, climate sensitivity and make future predictions. Which statement is FALSE?

            a.   there is a good fit between actual observations and the models; giving scientists  
                  confidence in their projections which could put climate sensitivity anywhere  between 1.5 degrees Celsius to 9 degrees Celsius temperature increases
            b.   predicted temperature trends do not take into account the impacts of both HUMAN and  NATURAL forces
            c.   studies of ancient climate provides information on climate sensitivity for CO2
            d.   data from ice cores demonstrate that fluctuations in temperature and CO2 have gone
                    hand in hand for at least the last 400,000 years
             e.   it is virtually impossible to determine whether CO2 is driving climate changes or
                    vice versa due to FEEDBACK LOOPS.