The WTO sets rules for international trade between nations, to allow for the best transactional commerce as possible.
The International Trade Organization was scrapped and was never used. OPEC includes most of the Middle-Eastern countries that produce petroleum and handle most of the world's commerce for oil. The Hanseatic League was a guild founded in Germany and included most of the Nordic countries, and championed the idea of free-trading.
I believe the answer is D. The Jungle is full of pictures and descriptions of the streets and homes during the 60s that were so utterly polluted by society. Hope it helped!
