GMAT Sentence Correction (SC) | The results of the companys cost-cutting measures are

The results of the company's cost-cutting measures are evident in its profits,which increased five percent during the first three months of this year after it fell over the last two years.

(A) which increased five percent during the first three months of this year after it fell - "it" reference is not clear + "increased" is simple tense, however present perfect "have increased" is needed as we do not know how far back these "first three months" occurred
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