Mixed farming refers to an agricultural system in which a farmer conducts different agricultural practices together, such as growing crops and raising livestock simultaneously. This method allows for diversification, reduced risk, and more efficient resource utilization.

Let's analyze the options given in the question:

• Eastern Africa: This region is more known for subsistence farming, pastoralism, and in some areas, commercial crop farming. Mixed farming is not commonly practiced here as the climatic conditions and traditional practices do not favor it.
• North Western Europe: This region is known for advanced agricultural practices, including mixed farming. Countries such as the UK, France, Germany, and the Netherlands practice mixed farming extensively. The climate and soil conditions in North Western Europe support a variety of crops and livestock, making it ideal for mixed farming.
• South East Asia: Agriculture in this region predominantly relies on rice cultivation and is primarily characterized by intensive farming rather than mixed farming. Although livestock is raised, it is not typically integrated into crop farming on a large scale like in North Western Europe.
• Amazon Basin: Known for its rainforest, the Amazon Basin does not typically practice mixed farming. The indigenous practices tend to be more towards shifting cultivation rather than permanent mixed farming systems.

Based on the above analysis, it is clear that North Western Europe is the correct answer, as this region's agricultural systems are characterized by mixed farming due to suitable climate conditions, land use, and agricultural policies.