Based on the information provided:
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It is True that Nigeria has significant oil reserves and production, contributing to its higher GDP compared to countries like Kenya and the Democratic Republic of Congo.
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Regarding the situation with the oil company:
- The company is choosing to shift its focus from drilling and transportation to processing. This indicates a decision to concentrate on a specific area of their operations where they may find better profitability. Therefore, the correct answer is: b. They decided to specialize.