An oligarchy- by definition- means, “A small group of people having control of a country, group, or organization.” (Source for definition: “Google”)
The answers not supported by this definition are: B, C, and D, as B and C are citizen-contributed systems, and D is a monarchy/dictatorship.
This leaves us with answer “A” being the only plausible answer to fit our description.
I hope this helps!
The United States sponsored the Contras because they were against the Sandinista government which was in place at the time in Nicaragua. The Sandinista government was a national reconstruction government, but it was a government that the United States viewed as communist. It came at the time where the United States was extremely weary of the Soviet Union and communist rule and a time when Reagan was president and his foreign policy was based very much on stopping opposing ideologies from gaining ground anywhere in the world.
The enormity of global warming can be daunting and dispiriting. What can one person, or even one nation, do on their own to slow and reverse climate change? But just as ecologist Stephen Pacala and physicist Robert Socolow, both at Princeton University, came up with 15 so-called "wedges" for nations to utilize toward this goal—each of which is challenging but feasible and, in some combination, could reduce greenhouse gas emissions to safer levels—there are personal lifestyle changes that you can make too that, in some combination, can help reduce your carbon impact. Not all are right for everybody. Some you may already be doing or absolutely abhor. But implementing just a few of them could make a difference.
