A. 500,000 indigenous people living in Brazil.
The answer is B. In South Asia, Islam found a place in a long-established civilization as invasions by Turkic-speaking warrior groups from Central Asia, recently converted to Islam, brought the faith to northern India. Thus the Turks became the third major carrier of Islam, after the Arabs and Persians, as their conquests initiated an enduring encounter between Islam and a Hindu-based Indian civilization.
If resources get low, the population's numbers can decrease.
