The decision which might be the best for Country A is to: C. focus on the petroleum industry only.
What is a comparative advantage?
A comparative advantage refers to the ability of a business firm or country to produce goods and services at a lower opportunity cost than their rivals (competitors) or trade partners.
The most important benefit of comparative advantage is that, it gives an a country an ability to produce more and sell her finished goods and services at a lower price in comparison with its close rivals (competitors) or trade partners in another country.
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