I'll go with E here, since everything else can be crossed out by POE.

Conclusion is "The extensive testing that the special building inspectors order for columns that they have already deemed intact after a disaster is a waste of money."

(A)Building inspectors who do not specialize in assessing the damage after a natural disaster are less likely than the special building inspectors hired to check buildings after such a disaster to judge the stability of a column correctly. ( no where in the argument is there a comparison between building inspectors and special building inspectors)
(B)Many buildings that are damaged in natural disasters do not rely on columns for support. ( Many but not all, some could still rely on columns)
(C)The results of strength and stability tests ordered by many different special building inspectors for columns deemed intact after many different natural disasters were reviewed. ( this one is clearly incorrect since there are not multiple building inspectors reviewing natural disasters and even if there are it doesn't strengthen the argument)
(D)The stability of columns deemed intact after reinforcement by iron core is always affirmed by strength and stability tests. ( the stability was intact before the iron core was used as well, so this doesn't get us anywhere)
(E)Building inspectors routinely order extensive strength and stability testing for columns even when these columns have never been affected by a natural disaster. ( the only one left and this says that the inspectors are wasting money since they are testing columns not even affected by disaster) - Correct
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IMO E.

(A)Building inspectors who do not specialize in assessing the damage after a natural disaster are less likely than the special building inspectors hired to check buildings after such a disaster to judge the stability of a column correctly.
(B)Many buildings that are damaged in natural disasters do not rely on columns for support.
(C)The results of strength and stability tests ordered by many different special building inspectors for columns deemed intact after many different natural disasters were reviewed.
(D)The stability of columns deemed intact after reinforcement by iron core is always affirmed by strength and stability tests.
(E)Building inspectors routinely order extensive strength and stability testing for columns even when these columns have never been affected by a natural disaster.
After a natural disaster, special building inspectors are hired to check buildings with columns for stability; those columns that are deemed intact and thus do not require reinforcement with iron core are often ordered to undergo extensive testing for strength and stability anyway, for the special building inspectors are concerned about the possibility of having misjudged the ability of such columns to withstand pressure without collapsing. When the results of some of the extensive tests were reviewed, however, no columns that had initially been deemed intact after a disaster were shown to have failed the strength and stability tests that were ordered anyway. Thus, the extensive testing that the special building inspectors order for columns that they have already deemed intact after a disaster is a waste of money.

Which of the following, if true, does the most to strengthen the argument?

(A)Building inspectors who do not specialize in assessing the damage after a natural disaster are less likely than the special building inspectors hired to check buildings after such a disaster to judge the stability of a column correctly. [Out of scope. Incorrect]
(B)Many buildings that are damaged in natural disasters do not rely on columns for support. [This is a case of SHELL GAME TRAP. Incorrect]
(C)The results of strength and stability tests ordered by many different special building inspectors for columns deemed intact after many different natural disasters were reviewed. [This is a case of OPPOSITE ANSWER. The trap here is many disasters reviewed. This is just opposite to one of the premises. Incorrect]
(D)The stability of columns deemed intact after reinforcement by iron core is always affirmed by strength and stability tests. [This is rather weaking the conclusion. Incorrect]
(E)Building inspectors routinely order extensive strength and stability testing for columns even when these columns have never been affected by a natural disaster.
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it is between B and E.

finally (B).

I gota a feeling .

Its B

OA Plz ?
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Finally KISSedGMAT 700 times 450 to 700 An exprience

Very good explanation by tryingharder.Is OA B?

Explanation by firang looks good. What is the OA?