It would be 1) <span>It is effective support for the claim Hope that helps!
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The first one is the correct way to use it, since it separates the parts of the sentence into fragments that can still be understood without changing the meaning of the entire sentence.
1) D This is because we are waiting to see what will happen now that they will no longer stay silent and be oppressed.
2) B Because the thermometer changed much in society.
Hope this helps!
