On What Grounds Did President Barack Obama Place a 35

On what grounds did President Barack Obama place a 35 percent tariff on the import of Chinese tires in 2009?

A) The tariff was part of the stimulus package designed to save the American auto manufacturing industry.
B) U.S.tire-makers needed the protection because they were forced to buy their raw materials from Chinese exporters.
C) The tariff was in retaliation to Chinese military exercises in the Yellow Sea.
D) U.S.tire-makers were less efficient than Chinese companies and needed government assistance.
E) Chinese tires were being subsidized by the Chinese government.