Which Statement Best Reflects Changing Social Attitudes Regarding the Use

Which statement best reflects changing social attitudes regarding the use of marijuana?

A) Cannabis abuse decreased in the late 1950s.
B) The Pharmacopoeia of the United States of America began excluding cannabis from its compilation of medicines after 1942.
C) Although the U.S. government began search and seizure operations at the U.S.-Mexico border in 1969, cannabis smugglers were mostly ignored.
D) As of 2011, current DEA Administrator Michele M. Leonhart is in strong support of lowering the scheduling of cannabis.