In the Span Between the Civil War and the First

Multiple Choice

In the span between the Civil War and the First World War,several factors combined to move the advertising industry to establish professional standards and regulate itself,including abuses by patent medicine advertisers;the examination of most of the country's important institutions,led by the muckrakers;and in 1914

A) the establishment of the Federal Trade Commission.
B) falling profits.
C) demands from magazines for more ethical operation.
D) demands from consumers.