|Question 7Verbal

Source Texts

Text
Proto-Kru is a protolanguage, or a hypothesized ancestral language, of all the Kru languages (thirty-eight languages that, because [Blank] descendants of Proto-Kru, can provide information about the protolanguage's structure).
Which choice completes the text so that it conforms to the conventions of Standard English?
its
A
they're
B
their
C
it's
D