Concept:Agricultural extension succeeds when it is practical, participatory, and adaptable to changing technology.
Explanation:The programme must be based on research that is tested on local conditions, so the ideas are relevant and workable.
It must involve the target farmers, because they are more likely to accept ideas they helped plan.
It should use trained specialists, but it must not rely on specialists alone and ignore the farmers' own participation.
Most importantly, the programme must remain flexible and open to new and current technology.
If the programme is rigid and not adjusted to contemporary technology, it will fail to disseminate new ideas effectively.
Therefore, the only condition that would prevent success is when the programme is not kept flexible to modern changes.
Answer:Option D — is not kept flexible to contemporary technology.