Which Scenario Represents Strategic Interaction in Trade

Which scenario represents strategic interaction in trade?

A) The United States creating a quota on sugar imports,due to lobbying from sugar manufacturers.
B) The European Union instigating a case against genetically modified organisms in the World Trade Organization to prevent U.S.agricultural imports.
C) Japan not raising tariffs on U.S.automobiles,as it fears retaliation from the United States.
D) France creating new tariffs on U.S.goods,due to concerns over domestic production.
E) Great Britain unilaterally liberalizing its agricultural sector.