Which of the Following Is Significant in Regard to the Ruling

Which of the following is significant in regard to the ruling in Webb et al. v. United States?

A) maintaining addicts on narcotic drugs, even by prescription, was illegal
B) that the Harrison Narcotics Act was unconstitutional
C) performing drug experiments on American citizens was deemed illegal and unethical
D) the United States would no longer import goods from opium-producing nations without implementing an additional 3.5% Narcotics Tax