My personal choice would be john Locke, i feel as Locke would tell American politicians that they are corrupt and should be overthrown. that this is not the america that the founding fathers envisioned for this country. He would say the the government controls the people and the people no longer control the government and it needs to be fixed or it will be replaced.
The head of government in a Parliamentary system would be the Prime Minister.
Hope this helps.
The answer would likely be C! Natural selection cannot select what a species need, the adaptions may be positive or negative.