A common barrier to communication in rural areas is lack of access to technology (option 2), such as limited internet connectivity, unreliable mobile networks, or lack of access to devices like smartphones or computers. These limitations hinder the dissemination of information through modern channels like digital platforms or mass media, which are critical for extension services. In contrast:
- Clear and concise language (option 1) facilitates communication, not hinders it.
- Active participation of farmers (option 3) enhances communication by fostering engagement.
- Use of visual aids (option 4) improves understanding, especially for low-literacy audiences, and is not a barrier.
Thus, option (2) is correct, as lack of technology is a significant communication barrier in rural settings.