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Verbal·Standard English Conventions·Boundaries
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From 2009 to 2019, travelers flew out of major urban airports with increasing        Washington Dulles International Airport in Washington, DC, saw a 6.9 percent increase in airline passengers, from 11,122,438 total passengers in 2009 to 11,892,778 in 2019.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
frequency, for example,
B
frequency, for example:
C
frequency, for example.
D
frequency. For example,