A beverage manufacturer changed the composition of a famous beverage they produced last year, and at the same time the export value of an island in the Indian Ocean began to decline. The island's only export product, vanilla beans, accounted for more than half of global supply. Therefore, analysts believe that the original ingredients of this famous drink contain vanilla extracted from vanilla beans, but not in the new ingredients. If the following statement is correct, which of the following is the most powerful way to enhance the inferences of analysts? ['Another neighboring island begins to plant and produce vanilla beans.', 'A laboratory in the United States is developing synthetic vanilla beans.', 'Sales of several other best-selling products containing vanilla are also declining.', 'The number of vanilla beans imported by the country where the beverage manufacturer is located has decreased.']