Under the 1997 Kyoto Treaty,the Industrialized Signatories

Under the 1997 Kyoto treaty,the industrialized signatories:

A) are not allowed to trade emissions rights.
B) are allowed to trade emissions rights among themselves,provided emissions goals are achieved.
C) must reduce emissions in the least cost-effective way,leading most industrialized countries to refuse to sign the treaty.
D) must reduce emissions only when it is cost-effective,resulting in participation by countries like the United States.