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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Answer:
Personal Health is important because we need to make sure we are taken care of before we try to care for others, if our health isn't taken care of it will be a challenge to be able to even work or be able to do all your tasks put at hand. If we are healthy then we are able to work and the economy is benefiting from this and so are you by working.
Answer:
I'm not exactly sure what you want, but if this is your writing great job!