Which of the Following Is a Reason for the Rapid

Which of the following is a reason for the rapid decline of socialism in the United States?

A) Moderate reforms of the populist movement came only because the threat of growing socialist popularity put pressure on the capitalist elite.
B) Socialist unions made a huge doctrinal error (though not a tactical mistake) when they labeled World War I an imperialist war and said that labor would refuse to shed its blood for wealthy capitalists.
C) Because of its electoral successes the Socialist Party chose to make itself less radical,thereby breaching socialist unity by alienating firebrand IWW leaders.
D) As time passed,the lot of most workers improved;real wages rose 37 percent and the average 50-hour workweek declined to 40 hours.