In each of the following sentences, a sentence is given with certain words in bold. Choose the pair/s of such words which need to be interchanged so as to make the sentence grammatically correct and meaningful.

The Supreme Court (a) consequential upholding at Karnataka law to preserve the (b) verdict seniority of Scheduled Caste/Scheduled Tribe candidates promoted on the basis of the reservation is notable for being the first (c) instance of quantifiable data being used to (d) justify reservation.