The answer is d, the Green Party. Traditionally around the world, green parties support pacifism and environmental causes, and this happens to be the same case in the US as well, despite the party’s lack of significance.
Well...the answer....is.....D
The obvious case is the consequence of climate change, where my emissions of greenhouse gases affects your sea level and climate (and vice-versa). aerial or marine pollution and overfishing in the oceans are others.
In a more restricted sense, one nation may hold all or most of a resource needed by all. Many nations are unable to feed themselves, at least to present standards, and therefore need to trade with others.
They didn't really give them a section they were just the lower of the five levels
