Question with-r

3.2 Form, Structure, and Sense - Consistent tone and style
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With residents from Mexico, China, El Salvador, and many other countries, Los Angeles has long been a city of cultural diversity. Even back in the 1860s, nearly 30% of the city’s population blank from outside the United States.

Which choice completes the text so that it conforms to the conventions of Standard English?

A.

is being

B.

was

C.

is

D.

will be