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Verbal·Standard English Conventions·Boundaries
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As cheesemaking practices spread throughout Europe and Asia during and after the Neolithic, divergent strategies for preserving milk        whereas rennet-coagulated cheesemaking became key to milk preservation in Europe and Southwest Asia, acid-heat coagulation methods became common among nomadic herding populations of the northeastern Eurasian steppe.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
emerged and
B
emerged
C
emerged:
D
emerged.