The efforts of U.S. oil and gas producers to request the imposition of tariffs on imported oil in order to boost the domestic oil industry is an example of b. protectionism.
Trade protectionism is an economic policy that restricts imports from other oil producing countries by imposing tariffs on imported oil. Other methods of practicing trade protectionism are import quotas and other government regulations.
a. free trade
b. protectionism
c. comparative advantage
d. global marketing
Thus, the efforts of the U.S. oil and gas producers is not an example of free trade, comparative advantage, or global marketing but protectionism.
Learn more about trade protectionism at https://brainly.com/question/1616157