Answer:
the right asnwer is D.
Step-by-step explanation:
the first three are measures to limit, prevent, or increase the costs of a merchandise entering the country, that is, importation (protectionist measures)
While with the export subsidies the intention of the country is to place a certain product or service outside its territories, for this it must encourage production in some way, for example this is achieved through deliveries or advances of money, postponement of taxes , suspension of taxes, special exemptions or preferential prices in its raw material.