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Verbal·Craft and Structure·Words in Context
easy
The Hare dog of Canada predated European colonization of the Americas but later vanished due to interbreeding with other types of dogs. In contrast, the Xoloitzcuintli, whose origins in Mexico also predate colonization, has persisted. And DNA testing suggests that the Carolina dog of the rural Southeastern US descends partly from precolonial breeds, with European dog breeds        the bulk of its ancestry.
Which choice completes the text with the most logical and precise word or phrase?
A
contributing
B
increasing
C
seizing
D
obscuring