GMAT Sentence Correction (SC) | Re: Prices at the producer level are only 1.3 percent higher now

zoezhuyan , I agree with my colleague Ron Purewal (cited above) that the comparisons in A and C aren't necessarily faulty. There are other reasons to eliminate those choices. However, I want to make a slight correction to your analysis above. Your use of "that of" or "those of" in parentheses makes it appear that the implied comparison is between two nouns. Actually, your choices should read ("they were") or ("it was"). The comparison is actually