Step 1: Understanding the Question:
Programme Planning is a deliberate effort to solve community problems. It follows democratic and scientific principles.
Step 2: Detailed Explanation:
• Needs and Interests (A): A program succeeds only if people feel it belongs to them and solves their specific problems.
• Participation (C): Extension is \enquote{with the people.} They must be involved in planning to ensure sustainability.
• Cultural Change (D): Extension aims at changing traditional habits. The plan must account for local culture and customs.
• Learning by doing (E): This is the fundamental philosophy of extension work. People believe more when they practice it themselves.
• Exclusion: While \enquote{Individual Approach} (B) is a contact method, it is not listed as a primary Principle of program planning. Principles usually focus on broader grassroots, democratic, and educational concepts.
Step 3: Final Answer:
The key principles are A, C, D, and E.
Therefore, the correct answer is D.