What Made It Impossible for the National Recovery Administration (NRA)to

What made it impossible for the National Recovery Administration (NRA) to regulate business effectively?

A) Large businesses that employed more workers were excluded from the agency's charge.
B) The codes written by industry leaders tended to serve the interests of corporations only.
C) The code system was so complicated that neither the government nor the corporations could interpret it effectively.
D) The government's NRA public relations campaign actually discouraged Americans from patronizing NRA businesses.