​Which of the following is/are meant for promoting the ideals of social and economic democracy?​

Correct option is D

The Directive Principles of State Policies (DPSPs) in the Indian Constitution are meant to promote the ideals of social and economic democracy: 

• Purpose: DPSPs are a set of guidelines that act as a reminder of the social and economic order that the Constitution envisions. They empower the state to create laws that promote the welfare of the people. 
• Location: DPSPs are found in Part IV of the Constitution, in articles 36 to 51. 
• Enforcement: DPSPs are non-justiciable, meaning they cannot be enforced by the courts if they are violated. However, the Constitution states that it is the duty of the state to apply these principles when making laws. 
• Real force: The real force behind DPSPs is public opinion. 

Incorrect options explanations:

• Single citizenship means that a person can only be a citizen of one country at a time. In India, the Constitution of India grants single citizenship to all citizens, regardless of their state of residence. This means that all Indians are citizens of India, and not citizens of their state of domicile.
• The Fundamental Duties are defined as the moral obligations of all citizens to help promote a spirit of patriotism and to uphold the unity of India. These duties set out in Part IV–A of the Constitution, concern individuals and the nation.
• A co-operative is an autonomous group of people who have come together voluntarily to achieve their common economic, social, and cultural needs and objectives through a democratically governed and collectively owned business.