To the best of my knowledge it's A
"<span>c. Its proximity to Africa and India made trade quite successful" is the best option, since a great deal of trade during this time and indeed today is done with ships. </span>
It would be the development in agricultural knowledge/technology
Development in agriculture enable hunter/gatherer society to shift their behavior. Before this, they had to keep moving from one place to another in order to seek food to live.
After the development in agricultural knowledge/technology, the society now can stay in one exact place for a long period of time and relied on agricultural product as their main source food.
After living in one same place for a long time, the needs to build things to accommodate their living start to arise. They start to built several things and repeat the process every year. In the end, large cities were developed from the initially small hunter/gatherer society.
Are there answers or is this an open response?
