Considering the available options the statement that would have been most likely to “set the stage” for Marco Polo to have been able to travel to the lands that he did is "the Pax Mongolica."
This is because "the Pax Mongolica" is a histographical description that illustrates the settling impacts of the conquests of the Mongol Empire on the socio-cultural and economic life of the people in Eastern Asia in which the Mongols empire conquered around the 14th century.
And also, Marco Polo was famous for traveling to Eastern Asia through the Silk Road particularly his traveling time in the Mongol Empire.
Hence, in this case, the correct answer is option A "the Pax Mongolica."
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