The major features of the social democratic stance are the following:

• Social democracy endorses liberaldemocratic principles and accepts that political change can and should be brought about peacefully and constitutionally.
• Capitalism is accepted as the only reliable means of generating wealth; socialism therefore, is not qualitatively different from capitalism.
• Capitalism is nevertheless viewed as morally defective, particularly as a means for distributing wealth; capitalism is associated with structural inequality and poverty.
• The defects of the capitalist system can be rectified by the state through a process of economic and social engineering; the state is the custodian of public or common interest.
• The nation-state is a meaningful unit of political rule, in the sense that states have a significant capacity to regulate economic and social life within their own borders”
• By redefining itself, social democracy gained power in the second half of the 20th century against neoliberalism in continental Europe. However, at the start of the 21st century, these achievements have weakened. Social democracy could not adapt itself over neoliberalism in terms of changing social and economic conditions, and because of the hegemonic policies of neoliberalism, social democracy declined.

Therefore, the correct option is D.