C. is the correct answer.
The purpose of transition words and phrases is to unify disconnected pieces of a writing.
<h3>The purpose of transition words and phrases</h3>
Transition elements include words and phrases that provide a connection between ideas, sentences, and paragraphs.
Additionally, Transitions help to make a piece of writing flow coherently and can turn disconnected pieces of ideas into a unified whole, and prevent a reader from getting lost in the storyline.
Read more on transition words and phrases;
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It depends on how you worded your essay and what your views on global warming are, the way I would word it is "in conclusion global warming is real and changing drastically every minute, and we don't fully know exactly how it will affect the world long-term" that's one way you can say it.
If you watch a video on it, They are amazed.
Your correct on everything