Suppose that, a country with a closed economy opens itself to international trade and becomes a net exporter. In that case, the price of that good will when the economy goes from closed to open for trade.

Increase.

Explanation: A closed economy is one in which there is no external trading, that is no importation or exportation activities with other countries. Territories in this bracket are often seen as self-sufficient and tend to encourage local production. However, when an economy transits from being closed to open to international or foreign trade, and becomes a net exporter, that is sells more than it buys, then the price of that good will increase as more will need to be produced than previous amounts provided locally in other to meet demands of export. This increase in demand will most certainly lead to increment in price.

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c is the correct answer.