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.

Iran’s decision to (a) reduce its commitments under the 2015 Joint Comprehensive Plan of Action, which sought to (b) warning its nuclear (c) capabilities, is more of a (d) curtail than a move to break the nuclear deal.