Answer:
C) a decreased focus on manufacturing
Explanation:
The shift from Jin to Song Dynasty between 1200 and 1450 led to an increase in population, a focus in agriculture and a decreased focus on manufacturing.
The correct answer is - trade.
The Sumerians engaged in trade with their move of exchanging their surplus food for materials like the copper that they needed to develop their weapons and thus their army forces. This was a very smart move from their side because they managed to use the resource they had in abundance but was scarce in the other surrounding areas so that they take what they need to become stronger and pretty much defend more efficiently from the same people they were engaging in trade with.
D/ establish the gold standard i hope it helped
