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The answer is Its.
Theirs/their pertains to more than one person belonging to items.
It's is a contraction form of "it is".
Answer: it is a primary source providing information to wartime detainees.
Explanation:
Relate this question to our past generations compared to our 21st century. Everything is different and now having the privilege for women to have independence and rights is very different from when pre-marital sex was frowned upon in the past.
