Passage of the 1906 Pure Food and Drug Act Took

Passage of the 1906 Pure Food and Drug Act took place ____.

A) shortly after publication of a series of muckraking articles in Collier's magazine
B) after five previous efforts to regulate the makers of proprietary medicines
C) after twenty previous efforts to regulate the makers of proprietary medicines
D) shortly before publication of Upton Sinclair's novel The Jungle