Explanation:

- Lack of storage facilities: Farmers often face challenges in storing their produce, leading to spoilage and loss.

- Lack of adequate finance: Limited access to credit and funds restricts farmers' ability to invest in better seeds, technology, or marketing infrastructure.

- Malpractices in unregulated markets: Unregulated markets can lead to unfair practices, price manipulation, and exploitation of farmers.

- All of the above: All these factors collectively pose significant challenges to agricultural marketing.