Which of These Best Describes the Comparison of Observed Changes

Multiple Choice

Which of these best describes the comparison of observed changes in CO2 production and IPCC model scenarios of expected CO₂ production?

A) Model scenarios predicted CO2 production about right.
B) Model scenarios overestimated CO2 production.
C) Observed CO2 production has exceeded the worst model scenarios.
D) Observed CO2 production rose but has recently declined below IPCC model scenarios.
E) CO2 production matches the middle range of model scenarios