In the 1970s, When the Idea of Organic Certification First

In the 1970s, when the idea of organic certification first emerged,

A) the U.S. government developed the National Organic Program.
B) multiple regional organic certification organizations were established, but they all used the same organic standard.
C) multiple regional organic certification organizations were established, with each having their own unique standards for organic agriculture.
D) organic farmers rejected certification.