I am not completely sure, but I think it might be B, Migration out of a stage 3 or 4 country is higher than migration to it.
<h3>In geography, the temperate climates (sometimes tepid climates) of Earth occur in the middle latitudes (23.5° to 66.5° N/S of Equator), which span between the tropics and the polar regions of Earth.[1] These zones generally have wider temperature ranges throughout the year and more distinct seasonal changes compared to tropical climates, where such variations are often small and usually only have precipitation changes.</h3>
Free Trade is favorable to countries that have control over capital. Small and medium enterprises have to strive harder to penetrate the market.
Huge competitors can dictate the prices of their product and affect the market because of monopoly. Trade restrictions favor for those capitalist nation whose technology are advanced and can do massive production.
