The sun hits bodies of water (ponds, oceans, pools, puddles) and it evaporates into a gas known as water vapor which goes up and forms a cloud. When the cloud gets heavy the water condensates back into little droplets and falls back to the ground. This is rain.
The answer should be A, "Communism promised jobs after the insecurities of war." Hope this helps!
Because with maps they knew where to go , without them they will be lost