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Question 126·200 Super-Hard SAT Reading Questions·Standard English Conventions

During early rehearsals for her groundbreaking productions, choreographer Katherine Dunham blended Caribbean social dances with ballet technique, a risky _____ required each performer to research the communities the dances came from; and rewrote sections of choreography nightly in response to musicians’ improvisations.

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