I think you'll find that PRC is the Peoples' Republic of China (not Korea) and that OPEC is the Organisation of Petroleum Exporting Countries. Also, why do you give the answer to USA and NYC before we've finished writing it whereas the others you require us to continue until the final letter?
PRC and OPEC are my mistake. NYC and USA is Jetpunk's answer system (it automatically takes some answers) which I can fix. The answers are now revised, thanks for letting me know.