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The argument states that a hedging strategy to avoid relying always on the checkpoints like the Suez Canal (which of course can have both geopolitical and operational limits) by exploiting Artic ice routes.

Hence this argument must have the basis on the fact that the benefits have to overcome the risks and the operational costs, otherwise there is no convenience in that.

IMO B!
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Conclusion: Developing arctic shipping route is necessary to make europe Asia trade safer, and more stable by reducing dependence on routes like the suez canal.
For the arctic to serve as a substitute for the suez canal, arctic should be reliably usuable. If arctic route continues to be highly unpredictable for most of the time due to ice then even with receding levels then investments in ports and ships would not actually enhance the efficiency. Hence, the arguement assumes that physical environment or ice level will cooperate enough to make these routs a viable alternative to reliable, year round passage of suez canal. This is what exactly option A conveys.
Arctic sea routes will for sufficiently reliable navigate over resistance portion of the year to serve as a practical substitute for traditional passage such as the suez canal.

A
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Summary: The report suggests investing in Arctic maritime infrastructure to achive long-term stability in transcontinental shipping.

A. CORRECT. Negate A -> Arctic won't be a practical substitute for traditional passages. Hence the dependence on chokepoints can not be reduced and this break the argument.
B. Incorrect. This is not necessary for the argument to depend on as the Arctic development can still be considered strategic even if it's more costly.
C. Incorrect. Flexibility is not necessary for the argument to hold.
D. Incorrect. This strengthen the argument but not necessary to be an assumption.
E. Incorrect. This is irrelevant.
Bunuel
As polar ice continues to recede due to climate change, policymakers have increasingly advocated for the development of Arctic maritime infrastructure as a means to mitigate strategic vulnerabilities in global trade logistics. A recent policy analysis contends that expanded investment in northern shipping corridors (including the construction of ice-hardened ports and specialized vessels) would reduce dependence on chokepoints like the Suez Canal, thereby enhancing the resilience and efficiency of trade between Europe and East Asia. The report concludes that, given recent disruptions in southern sea lanes, Arctic development constitutes a necessary strategic hedge for long-term stability in transcontinental shipping.

Which of the following is an assumption upon which the argument depends?

A. Arctic sea routes will offer sufficiently reliable navigability over a sustained portion of the year to serve as a practical substitute for traditional passages such as the Suez Canal.
B. The marginal gains in shipping efficiency associated with polar transit will outweigh the capital costs and environmental risks involved in developing northern maritime corridors.
C. Current shipping patterns are sufficiently rigid that infrastructure investment, rather than route flexibility, is required to mitigate future disruptions.
D. Southern trade chokepoints are likely to remain vulnerable to geopolitical or environmental disruptions over the next several decades.
E. Major actors in transcontinental shipping will adopt route decisions primarily based on considerations of long-term strategic resilience rather than short-term operational costs.

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Long convoluted, boring paragraphs like these are very GMAT-coded in how they are meant to challenge your ability to focus despite all this and still derive key information.

It helps to simplify things: With polar ice caps melting due to global warming, policymakers suggest, let's take advantage for the increase in Arctic (polar region) ship routes - by investing in maritime infrastructure, like ice-hardened ports and specialized vessels. How will this help? Strategically. Areas like Suez Canal are major chokepoints that can be helped by easing things, among other trade logistics bottlenecks that can also be helped. Next, we have a policy analysis to back this strategic advantage.
The report's conclusion then - given how southern sea lanes - like the Suez Canal, and other elements - are being overburdened and disrupted, this Arctic developed is key for long-term stability in long-distance shipping.

^Sure, I've added a few key words here and there, but as long as one can disregard their weight in picking answers, this explanation should help.

We need to find the assumption the argument depends on.

A. Arctic see routes will offer sufficiently reliable navigability over a sustained portion of the year, to serve as a practical..."

Clearly, this works, because if we take the inverse - "There won't be sufficient reliability with these sea routes" then it defeats the purpose of the argument.

B: "Marginal gains in shipping efficiency will outweigh capital costs..."

Now, here's the thing. If there isn't a marginal gain - if it's a major gain, or not even a gain at all - in shipping efficiency, that won't matter. We aren't looking at shipping efficiency, but alternative routes to help with shipping altogether.

C: "Current shipping patterns are sufficiently rigid. Investments, and not flexibility, will mitigate future disruptions..."

This is a weakener. Goes against the argument, so no point of treating it as an assumption.

D: "South chokepoints will remain vulnerable..."

Another weakener. If these chokepoints will continue to remain, the transatlantic arctic corridors won't make a significant impact.

E: "Major actors in shipping will adopt decisions based on strategic resilience"

This is irrelevant. The strategic resilience is what will define the state of maritime shipping - that the presence of multiple routes will give multiple option. It isn't an individual decision that'll impact anything, but rather, a state of being that'll improve the overall shipping industry.

Bunuel
As polar ice continues to recede due to climate change, policymakers have increasingly advocated for the development of Arctic maritime infrastructure as a means to mitigate strategic vulnerabilities in global trade logistics. A recent policy analysis contends that expanded investment in northern shipping corridors (including the construction of ice-hardened ports and specialized vessels) would reduce dependence on chokepoints like the Suez Canal, thereby enhancing the resilience and efficiency of trade between Europe and East Asia. The report concludes that, given recent disruptions in southern sea lanes, Arctic development constitutes a necessary strategic hedge for long-term stability in transcontinental shipping.

Which of the following is an assumption upon which the argument depends?

A. Arctic sea routes will offer sufficiently reliable navigability over a sustained portion of the year to serve as a practical substitute for traditional passages such as the Suez Canal.
B. The marginal gains in shipping efficiency associated with polar transit will outweigh the capital costs and environmental risks involved in developing northern maritime corridors.
C. Current shipping patterns are sufficiently rigid that infrastructure investment, rather than route flexibility, is required to mitigate future disruptions.
D. Southern trade chokepoints are likely to remain vulnerable to geopolitical or environmental disruptions over the next several decades.
E. Major actors in transcontinental shipping will adopt route decisions primarily based on considerations of long-term strategic resilience rather than short-term operational costs.

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A. Relevant since if this assumption is not true, then the arctic routes wont be able to reduce dependence on Suez in a meaningful manner and the arctic development wouldnt make sense since it cant be a hedge too.
B. Irrelevant since the argument is talking about about mitigating strategic vulnerabilities and capital costs can be expensive
C. Irrelevant since even if the firms are seen to be flexible the arctic routes are still helpful and the argument doesent rely on pattern rigidity
D. Irrelevant since the argument still stands even if its false because the chokepoints could still be disrupted occasionally and a backup route is still helpful
E. Irrelevant since the government could possibly invest even if the firms resist

A.
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