Concept:
The Training and Visit (T&V) system is an agricultural extension approach designed to improve knowledge transfer from experts to farmers.
Step 1: Understanding T&V System
• Developed to improve efficiency of extension services.
• Focuses on regular training of extension personnel.
Step 2: Core Features
• Fixed schedule of farmer visits.
• Continuous training sessions.
• Systematic knowledge dissemination.
Step 3: Option Analysis
Option (A)
• Monitoring is secondary, not primary focus
Option (B)
• Core principle of T&V system
• Hence correct
Option (C)
• Not related to extension teaching method
Option (D)
• Related to market infrastructure, not extension system
Final Conclusion:
\[
\boxed{\text{Structured training + scheduled visits}}
\]
\[
\boxed{\text{Option (B)}}
\]