Concept:Agricultural extension methods are the various ways of disseminating new ideas and techniques to farmers, commonly grouped into three main classes.
Explanation:The mass media method includes radio, television, and posters used to reach many farmers at once.
The group method involves demonstrations, field trips, and group discussions with farmers.
The individual method uses farm visits and personal contacts with a single farmer.
Options A, B, and C are all recognized extension methods.
Since none of them is an exception, the correct choice is the option that states this.
Answer:D. none of the above