Sentence Correction (SC) | Re: Standard & Poor's, publisher of the greatly followed S&P 500 Index

A and B have "like" error.
C has comparison error as "index" is getting compared with "before". Also, C shows intention - a different meaning than the meaning of the original sentence.
E has parallelism error - S&P's...has changed the composition....and makes the index.
Therefore, the answer is D.

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