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unicornilove
How is B not an answer here? It directly weakens --> STOP imports from Qatania. So what if they are gas exporters themselves? It doesn't mean they dont import from Qantania.
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Hi. You are not incorrect in your assumption. However, For B answer choice to work, you have to have multiple assumptions. GMAT CR does not like multiple assumptions (one is OK). It has to be a direct cause and effect. 

With B, you have to have the following assumptions (which are unknown) and therefore this is the reason this cannot be the correct answer: 
  1. We have to assume that the gas exporing neighbors have imported meaningful amoung of gas in the past and their change will reduce those exports. The need to import gas by gas exporters is doubtful but it could be true - you are not incorrect
  2. We have to assume that other export options such as shipping, LNG, and other export routes cannot handle the delta of neighbors not importing additional gas
  3. And finally, We have to assume that the reinvestment plan to produce the gas will actually work and there will be enough gas to actually increase the production for exports to increase (that was the bottleneck)

Ultimately we do not know how much neighbors imported or if they did at all. We do not know where the exports took the gas, and that is the reason B cannot be the correct choice. . 
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I got confused b/w C&D and for those who may spend 2 hours trying to guess why here is my answer:

C - What is flaw in plan - didn't account for extra amount of oil needed domestically - so the planned new plants are not enough
D- Why not - this is an implementation issue. Not a planning issue. His plan is right - just he is not able to execute it.
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Hi,

To undermine, we want something that breaks the link between new wells and higher exports.
D attacks: More production doesnt necessarily mean more exports.

C, by contrast, only introduces financing details and does not show that the plan cannot work.

Hope this helps!

Goldenfuture
I got confused b/w C&D and for those who may spend 2 hours trying to guess why here is my answer:

C - What is flaw in plan - didn't account for extra amount of oil needed domestically - so the planned new plants are not enough
D- Why not - this is an implementation issue. Not a planning issue. His plan is right - just he is not able to execute it.
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