Greenhouse effect, Latitude, heat transport in the biosphere.
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.
The two main tributaries are Bear Creek and Turkey Creek. The watershed extends from Mount Evans Wilderness to the Town of Morrison.