The correct answer is D) All of the above.
Agricultural extension services, farmer cooperatives, and agricultural universities all play a crucial role in disseminating information on cropping patterns.
Agricultural extension services are government agencies that provide technical assistance and training to farmers. They can provide information on new cropping patterns, as well as on how to manage existing crops.
Farmer cooperatives are organizations of farmers that work together to improve their economic well-being. They can provide information on new cropping patterns, as well as on how to market their crops.
Agricultural universities are institutions of higher education that offer programs in agriculture. They can provide research-based information on new cropping patterns, as well as on how to manage existing crops.
All of these organizations play an important role in helping farmers to improve their productivity and profitability.