GMAT Critical Reasoning (CR) | Re: Shopkeeper: Every year, for the past five years, we have had to raise

Looks D. The argument is based on the premise that there has been an annual increase in heating oil price in Navinia. D weakens the claim by suggesting that Navinia will not increase the price of oil that is meant for export. If that's the case, there won't be a need to increase merchandise price this year.

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