Mashaal Masha
Archaeologists have estimated that the pre-Columbian Native American city of Cahokia, located across the Mississippi River from modern-day St. Louis, Missouri, had as many as 20,000 inhabitants in the year 1150 ________ it one of the largest cities in North America at the time.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A: 

CE making

B: 

CE. Making

C: 

CE, making

D: 

CE; making

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