The answer is; B
This western part of the slope faces the Pacific ocean. Therefore sea breeze from the ocean in the daytime, which is warm and moist, is forced up the mountain where it cool as it ascends and the moisture condenses into precipitation. This is why this side is the windward. The dry air then descend into the leeward side (the eastern region of the mountain). This part of the mountain is drier than the western region.
Division of ethnic groups to different parts of the continent
Socialist/Leftist, Conservative, Environmentalist, Alt-Right, Nationalist
A couple of niche political views from political parties across the world: Pan-Arabism, Zionism, Pan-Africanism
The answer is: birth rate ,death rate and migration patterns