But they pay little attention to the opposite and more treacherous failing: false certainty, refusing to confess their mistakes and implicitly claiming (i) ______ , thereby embarrassing the nation and undermining the Constitution, which established various mechanisms of self-correction on the premise that even the wisest men are sometimes wrong and need, precisely when they find it most (ii) ______ , the benefit of (iii) ______ process.

Blank (i)	Blank (ii)	Blank (iii)
(A) infallibility	(D) discomfiting	(G) an adaptable
(B) immunity	(E) expedient	(H) a remedial
(C) impartiality	(F) imminent	(I) an injudicious

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can it be adaptable if remedial was not an option?

I am finding a little difficult to convince myself that the second answer should be discomfiting and not expedient. Doesn't "precisely when they find it most" directs to the point that the blank should be filled with something opposite of embarrassing? As for the third one, wise politicians are allowed to make mistakes and provided with scopes to make amends in the constitution. That is why it should be remedial. But the word adaptive directs that the constitution changes with the course of action of the politicians. Can you please make me understand this at length?

Regards,
Scrat