A region of the Soviet Union encompassing the present-day city of Elista, Russia, the Kalmyk-speaking Kalmyk Autonomous Soviet Socialist Republic was in fact only nominally autonomous. President Mikhail Gorbachev’s reforms, by helping the Kalmyk Republic and other Soviet republics established along ethnolinguistic lines assert their prerogatives, __________ to the Soviet Union’s breakup.
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Verbal·Standard English Conventions·Form, Structure, and Sense
hardWhich choice completes the text so that it conforms to the conventions of Standard English?
A
which contributed
B
contributed
C
having contributed
D
contributing