Why Does the Kyoto Protocol Include Different Limits for Greenhouse

Why does the Kyoto Protocol include different limits for greenhouse emissions for different countries?

A) Some countries naturally emit more greenhouse gases than others, so the standards reflect this disparity.
B) Developed countries were considered more capable of reducing greenhouse gas emissions, so their limits were more stringent than the limits for developing countries.
C) Developing countries needed to focus on creating economic opportunity, so no emission limits were placed on them.
D) Developing countries required cap-and-trade credits, so their emission limits were set higher than the limits for developed countries.