In the following question, a sentence is given with four words marked as (A), (B), (C), and (D). These words may or may not be placed in the correct order. Four options with different arrangements of these words have been provided. 

As successive central and state administrations have(A) found, curbing illegal migration between(B) coordinated action requires(C) India and its neighbours, first at the political and then at(D) the security level.