The eco-friendly agricultural practice among the options provided is organic farming.

Organic farming is an approach that emphasizes the use of natural methods and materials to cultivate crops and raise livestock. It avoids the use of synthetic pesticides, fertilizers, genetically modified organisms (GMOs), and growth regulators. Instead, organic farmers focus on building healthy soil, promoting biodiversity, and using organic inputs such as compost, manure, and natural pest control methods.

Organic farming practices prioritize sustainability, environmental conservation, and the health and well-being of both the consumers and the ecosystem. By avoiding synthetic chemicals and promoting natural soil fertility, organic farming helps protect water quality, reduce soil erosion, preserve biodiversity, and minimize negative impacts on ecosystems.

On the other hand, shifting cultivation involves clearing and cultivating land for a short period before moving on to a new area, which can lead to deforestation and soil degradation over time. Cultivation of high-yielding varieties often relies on the use of synthetic inputs, including pesticides and fertilizers, which can have negative environmental consequences. Growing plants in glasshouses may require intensive resource use, such as energy for temperature control, and may not necessarily align with sustainable and environmentally friendly practices.

Therefore, among the options provided, organic farming is the most eco-friendly agricultural practice.