Industrialists from the country Distopia were
accused of promoting the Distopian intervention in
the Arcadian civil war merely to insure that the
industrialists' facilities in Arcadia made substantial
profits during the war. Yet this cannot be the motive
since, as the Distopians foresaw, Distopia's federal
expenses for the intervention were eight billion
dollars, whereas, during the war, profits from the
Distopian industrialists’ facilities in Arcadia totaled
only four billion dollars.

Which of the following, if true, exposes a serious
flaw in the argument made in the second sentence
above?

(A) During the Arcadian war, many Distopian
industrialists with facilities located in Arcadia
experienced a significant rise in productivity
in their facilities located in Distopia
(B) The largest proportion of Distopia's federal
expenses is borne by those who receive no
significant industrial profits.
(C) Most Distopian industrialists' facilities located
in Arcadia are expected to maintain the level
of profits they achieved during the war.
(D) Distopian industrialists' facilities in Arcadia
made substantial profits before the events
that triggered the civil war.
(E) Many Distopians expressed concern over the
suffering that Arcadians underwent during
the civil war

Please explain... i am confused between A and B

Please correct the OA for the question. In the link above OA is B whereas in this page on the answer box when I keyed in B it pointed it out as wrong. Also please check the OA before posting questions because it can affect other's GMAT preparation.

The link above correct states OA is B for this question and not A.