The evidence from the passage that supports this claim about smallpox is B. The Arab expansion, the Crusades, and the discovery of the West Indies all contributed to the spread of the disease.
It should be noted that a claim simply means the message that the author wants to pass to the readers.
In this case, the evidence from the passage that supports this claim about smallpox is that the Arab expansion, the Crusades, and the discovery of the West Indies all contributed to the spread of the disease.
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