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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Confort zone refers to the brunch of situations at which a specific individual feels comfortable. He/She knows perfectly how to act and react in that environment and it does not suppose a challenge to perform properly in these situations.
On the contrary, when someome steps out of the comfort zone starts to feel vulnerable, hesitates and needs to think many times about the next step in the path. But for many, like the users of the sentence "''life begins at the end of your comfort zone'' feeling the risk and achieving to overcome, is actually what makes you feel alive.
Answer:
This quotation is from the beginning of Chapter I, “Into the Primitive,” and it defines Buck’s life before he is kidnapped and dragged into the harsh world of the Klondike. As a favored pet on Judge Miller’s sprawling California estate, Buck lives like a king—or at least like an “aristocrat” or a “country gentleman,” as London describes him. In the civilized world, Buck is born to rule, only to be ripped from this environment and forced to fight for his survival. The story of The Call of the Wild is, in large part, the story of Buck’s climb back to the top after his early fall from grace. He loses one kind of lordship, the “insular” and “sated” lordship into which he is born, but he gains a more authentic kind of mastery in the wild, one that he wins by his own efforts rather than by an accident of birth.
Explanation: