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Here is my 2 cents.
The line of reasoning in the passage: Conclusion: The purpose that industialists promoted Distopian intervention in the Arcadian civil war is NOT making substantial profits during the war.
Because (Evidences) 1: During the war, profits from the Distopian industrialists' facilities in Arcadia totaled only four billion dollars. 2: During the war, Distopia's federal expenses for the interention were eight billion dollars. 8 billion>4 billion, input>output. The industialists's purpose must be something else, because this looks like a bad deal for businessmen.
Question asks to find the flaw in this line of reasoning with the information answers provided. Now let's look at the answers.
A: kind of convincing, however pay attention to the word "productivity". It is the "prodictivity" that increased during the war, not the "profit". I remember, ETS uses this trick very often. There are several problems in OG using the same trick.
C: Whether the facilities can maintain the level of profits in the future has nothing to do with making big profit during the war.
D: What happened before the war has nothing to do with industialists's purpose to make profit during the war.
E: totally out of scope.
B: I believe there is a hidden assumption in the argument, which is all the federal expense is used to generate the profit. However, if what B said is ture most expense is borne by those industries received no significant profit, it means that only a small propotion of 8 billion expense is used to generate the 4 billion profit(now it looks like a good deal). This make the assumption no longer hold. So I think B is the right answer, hope I am right:-).
Wish this help.
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