Explanation:

- Challenge of Rural Marketing: Rural marketing involves connecting with a dispersed and diverse consumer base. Issues include infrastructure, distribution logistics, and varying customer needs and preferences.

- Challenge of Organic Farming: Transitioning to organic farming is complex. It requires adapting new methods, managing costs and labor, and adhering to regulations and consumer expectations.

- Exploring Options of Sustainable Livelihood: This involves creating enduring income sources that do not deplete resources. Challenges include identifying viable opportunities and aligning with community and environmental goals.

- Both b and c: These represent the dual challenge of shifting to organic practices while ensuring sustainability and new livelihoods.

Answer: Option 4 - Both b and c

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