|Question 16Verbal

Source Texts

Text
The present-day city of Engels, Russia, was for years the capital of the Volga German Autonomous Soviet Socialist Republic, one of many nominally autonomous republics within the Soviet Union. Like        peer autonomous Soviet socialist republics, the Volga German Republic was established along ethnolinguistic lines: most of the republic's residents spoke German.
Which choice completes the text so that it conforms to the conventions of Standard English?
it's
A
their
B
its
C
they're
D