What does the export commodity concentration ratio of a country represent?

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The average yearly investment allocated to producing export goodsThe share of the main export product within the total exportsThe proportion of the top four export commodities relative to the entire merchandise exportsThe total annual funds invested in the production of export commodities

Explanation

Option A refers to the average yearly investment in export production, which is not related to concentration ratio. Option B indicates the share of the single largest export product, whereas the concentration ratio considers multiple leading commodities. Option C correctly defines the export commodity concentration ratio as the combined share of the four principal export products in total merchandise exports. Option D relates to total investment, which does not measure concentration.