The Kyoto Protocol commits the developed nations, including economies in transition to reduce emissions of greenhouse gases by which one of the following during the years 2008-2012 ?

• A. (A) An average of 4% below 1990 levels
• B. (B) An average of 5% below 2000 levels
• C. (C) An average of 4•2% below 2000 levels
• D. (D) An average of 5•2% below 1990 levels