Japan requires that all U. S.-made cars sold in Japan be sold by existing Japanese dealers who are themselves controlled by Japanese car manufacturers (i. e., a nontariff barrier). In retaliation, the U. S. has taxed nearly all Japanese cars imported into the U. S. Therefore, the U. S. has imposed:. A. a tariff on Japanese cars, while Japan has imposed a nontariff barrier on U. S. cars. B. a quota on Japanese cars, and Japan also has imposed a quota on U. S. cars. C. a nontariff barrier on Japanese cars, while Japan has imposed a quota on U. S. cars. D. a nontariff barrier on Japanese cars, and Japan has also imposed a nontariff barrier on U. S. cars.