The Free Trade Agreement Tariff Tool allows US businesses to: a) request that tariffs not apply to their products. b) access tariff rates when planning to export. c) know which countries are entering trade associations. d) access new trade agreements as they are developed.

b) access tariff rates when planning to export.

Explanation:

The Free Trade Agreement Tariff Tool helps people to get information about the tariff rates of products that are included in the different trade agreements that the US has and the rules of origin that apply in each case for the companies to know if they are able to access the special rates. According to this, the answer is that the Free Trade Agreement Tariff Tool allows US businesses to access tariff rates when planning to export as this tool contains the tariff rates of the trade agreements that the US has negotiated.

a) request that tariffs not apply to their products.

Explanation:

A free trade agreement is a pact between two or more nations to reduce barriers to imports and exports among them. Under a free trade policy, goods and services can be bought and sold across international borders with little or no government tariffs, quotas, subsidies, or prohibitions to inhibit their exchange.

A free trade agreement (FTA) or treaty is a multinational agreement according to international law to form a free-trade area between the cooperating states. ... In a free-trade area without harmonized external tariffs, to eliminate the risk of trade deflection, parties will adopt a system of preferential rules of origin.