I would say A. It would be difficult to find workers for jobs that people didn't desire. Like how minorities pick produce nowadays and you don't hear of white people picking produce.
Islamic ideas and cultures spead along the asian trade routes because of traders and craftsmans going along the routes. As they webt the introduced new ideas to the world. Then many traveled to Islamic land to trade or learn and experienced the Islamic culture and religion. Later many muslim Families moved around to Asia as the Islamic land became populated, spreading even more islamic culture and ideas.
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Set up banks across the country for people to keep their money safely
