I believe the answer is d.) Measures that would help unify the populace of ireland
Answer: D: it creates a matter of fact tone
Explanation:
Come again? I'm not understanding the question.
Segregation; the two different races are being segregated (separated) from each other. Hope this helps :)
Your answer should be WHO.
Think of it like this: You wouldn't say "The boy it (a variant of 'which')", because it simply just sounds odd. Instead, you're wired to think "The boy, he (an unknown name, so it would be 'who')".