Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.

The test of truth is not ------- , for we have often felt firmly convinced of many things that were not so.


(A) implication
(B) certitude
(C) originality
(D) impartiality
(E) moderation



Answer :

the answer is B)certitude. implication, originality, impartiality, moderation have nothing to do with whether something is true or whether people think something is true. 
The test of truth is not certitude, for we have often felt firmly convinced of many things that were not so.