Questions Refer to the Passage Below

Questions refer to the passage below. Use the passage and your knowledge of world history to answer the following questions.
"The plague frightened and killed. It began in the land of darkness. Oh, what a visitor! It has been current for fifteen years. China was not preserved from it nor could the strongest fortress hinder it. The plague afflicted the Indians in India. It weighed upon the Sind. It seized with its hand and ensnared even the lands of the Uzbeks. How many backs did it break in what is Transoxiana! The plague increased and spread further. It attacked the Persians, extended its steps toward the land of Khitai, and gnawed away at the Crimea. It pelted Rum with live coals and led the outrage to Cyprus and the islands. The plague destroyed mankind in Cairo. Its eye was cast upon Egypt, and behold, the people were wide-awake. It stilled all movement in Alexandria. . . ."
Plague in Southwest Asia Ibn al-wardi (1349)
-The MOST immediate cause of the Black Death was:

A) the impact of the "Little Ice Age" in Europe.
B) trade connections throughout Afro-Eurasia.
C) the Mongol conquests of the thirteenth century.
D) changing climate patterns in the central Asian steppe borderlands.