Mashaal Masha
in the 2011 documentary _The Barber of Birmingham_, civil rights activist James Armstrong recounts how his barbershop in Birmingham, Alabama, ________ as a political hub for members of the Black community during the 1950s.

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

serving

B: 

having served

C: 

served

D: 

to serve

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