The answer is: [D]:
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They are often used to combine choppy sentences.
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Conjunctions are often used to combine choppy sentences.
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Note: The questions asks about CONJUNCTIONS —NOT about "contractions".
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Choice "A" is incorrect. They are not used to combine two or more LONG sentences. If sentences are already long, then do not need to be combined with a conjunction.
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Choice: "B" is incorrect. To the contrary, the use of conjunctions actually makes sentences longer.
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Choice "C" is incorrect. To the contrary, the use of conjunctions should be used (appropriately, of course) in essays. The use of "contractions" should not be used in essays or formal writing.
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Choice "D" is correct. They are often used to combine choppy sentences for better reading and engagement.
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I think it’s C, really sorry if i’m wrong
Unreadable
There is no reason to read the poorly written.
Because he bites them or cuts them
The answer is Some villagers became Christian and others did not, so the villagers were no longer unified by long-established customs. because not everyone wanted to adapt another religion and different cultures and this caused problems between the villagers.