Explique la siguiente frase que se encuentra en el texto "En cierta medida, la emigración fue una válvula que permitió aligerar los conflictos sociales generados por la crisis"

Who ever answers first gets ! trade in the vedic age led to a.the rise of kingdoms because of the importance of controlling land and long-distance travel routes b.the building of an extensive system of roads because of the difficult terrain c.the creation of a large banking class because of the need to exchange different currencies d.the development of a centralized government that controlled the economic decisions of its people