Which of the Following Is One of the Two Conditions

Multiple Choice

Which of the following is one of the two conditions that had to be satisfied for the Kyoto Protocol to come into force?

A) It had to be ratified by all the non-Annex I countries.
B) It had to be ratified by 55 percent of all member countries.
C) It had to be ratified by Annex I parties accounting for 30 percent of that group's carbon dioxide emissions in 1990.
D) It had to be ratified by 40 percent of all the non-Annex I countries.