Step 1: Understanding the Question:
Training is a systematic process of changing the behavior of people. For extension work, it must be Practical and Need-based.
Step 2: Detailed Explanation:
• Needs (A): If the content doesn't solve the workers' problems, they won't use it.
• Manual Skills (C): Extension is \enquote{learning by doing}. Teaching skills like pruning or soil testing is essential.
• Attitudes (E): Good extension workers need patience and empathy. Training must foster these.
• Exclusion: Statements B and D specify a fixed number of days (\enquote{Three days}, \enquote{Two days}). Appropriate training depends on the Subject Matter, not a rigid calendar. These are too narrow to be general requirements.
Step 3: Final Answer:
The qualitative requirements are A, C, and E.
Therefore, the correct answer is D.