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Question 38·Medium·Inferences

In rural parts of Yorkshire, England, boundary walls are built without mortar using "through stones" that span the full width of a double-stacked wall, binding the sides together. Early farm walls in New England, constructed in the late 1700s, display the same technique. Ship manifests and land records show that many of these farmers emigrated from Yorkshire and neighboring counties. Thus, historians have concluded that _____

Which choice most logically completes the text?