In Regards to the Uncommon Length of the Great Depression

In regards to the uncommon length of the Great Depression, both Schumpeter and Higgs contend that

A) private investment remained depressed in part due to the political climate created by the New Deal.
B) Social Security and the freedoms granted to labor, along with a progressive tax structure promoted growth in private investment.
C) the undistributed profits tax of 1936 encouraged businesses to undertake long-term investments.
D) the New Deal rhetoric from President Roosevelt, offered a pro-business slant that offended labor groups.