According to Some Political Scientists,during the 1950s,state Political Parties

According to some political scientists,during the 1950s,state political parties

A) became further weakened by the rise of candidate-centered campaigns.
B) retained their robust role in the political system,as in the mid-nineteenth century.
C) became stronger and more central to political campaigns.
D) established permanent headquarters and hired specialized staff to raise contributions and direct campaigns.