Old GRE TC question

A _____ acceptance of contemporary forms of social behavior has misled a few into believing that values in conflict with the present age are for all practical purposes ____.

(A) casual. .reliable
(B) superficial. .trenchant
(C) complacent. .superseded
(D) cautious. .redemptive
(E) plaintive. .redundant

How did you approach it ?

I was unable to solve it
Maybe by dividing the sentence into two parts using ‘that’. But there are 2 blanks on 2 sides.

From the language of the sentence above , a good guess for the blank(ii) will be useless or obsolete . Now, if you’re saying something is useless without being critical of it (or not liking anything that go against your belief )then what kind of social behaviour are you showing ? pompous would be a good guess for blank(i)