Formal i think
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Answer:
Increased economic growth and trade
Explanation:
The main objective of the invasions was the discovery of riches and the exploitation of the region's resources to promote trade and economic growth in the dominant nation. In this case, labor was needed to exploit these resources and the region's economic potential. This need for people working in the invaded areas was what led to the development of new states, which would work for the economic and commercial enrichment of the dominant nation.
I am pretty sure it is a. But the Indus valley writing was not discovered yet. They are still working on translating it
<span>The favorable environment and climate.
Hope this helps!</span>