The correct answer is D) Skilled workers leave impoverished states for the chance to work in wealthier areas.
The scenario that describes a mass migration caused by economic factors is "Skilled workers leave impoverished states for the chance to work in wealthier areas."
This statement is correct because the question is referring to "economic factors." This is when people live in a poor country and they want to find a job in other places to give their family better-living conditions. These people are skilled jobs that can offer their services in other countries. That was the case of many Europeans that emigrated to the United States in the 1800s. There are other factors.