Correct Option: B. Ghezira Plains Detailed Explanation: The Ghezira Plains, located in Sudan, are renowned for their extensive irrigation agriculture. This region is situated between the Blue Nile and the White Nile rivers, which provide a reliable source of water essential for irrigation. Here’s a step-by-step breakdown of why the Ghezira Plains is the correct answer:

1. Geographical Context: The Ghezira Plains are part of the larger Sudanese agricultural landscape. The area benefits from the proximity to two major rivers, which are crucial for irrigation. The Blue Nile and White Nile converge near Khartoum, and their waters are diverted into canals that irrigate the Ghezira region.
2. Irrigation Techniques: The Ghezira scheme employs modern irrigation techniques, including the use of canals and pumps to distribute water efficiently across the plains. This system allows for the cultivation of various crops, including cotton, sorghum, and wheat, which are vital for both local consumption and export.
3. Agricultural Output: The Ghezira Plains are one of the most productive agricultural areas in Sudan, significantly contributing to the country's economy. The successful irrigation practices here have transformed the arid landscape into fertile farmland, showcasing the effectiveness of irrigation agriculture.
4. Historical Significance: The Ghezira scheme was initiated in the early 20th century and has since evolved into a model for irrigation agriculture in arid regions. It demonstrates how human ingenuity can harness natural water resources to enhance agricultural productivity.

Why the Other Options Are Incorrect:

• A. Southern part of Sudan: While the southern part of Sudan does have agricultural activities, it is not as well-known for irrigation agriculture as the Ghezira Plains. The southern region is characterized by a more diverse climate and less reliance on irrigation compared to the Ghezira.
• C. Great Rift Valley: The Great Rift Valley is a geological feature that runs through several countries in East Africa. While it has areas of agricultural activity, it is not specifically noted for irrigation agriculture. The valley is more recognized for its unique geological formations and lakes rather than extensive irrigation systems.
• D. The Zaire Basin: The Zaire Basin (now known as the Congo Basin) is primarily a rainforest region with a significant amount of rainfall. While there is some agriculture, it is not predominantly irrigation-based. The dense forest and wet climate make traditional irrigation less necessary compared to drier regions like the Ghezira Plains.

Summary of Key Points:

• The Ghezira Plains in Sudan are a prime example of successful irrigation agriculture, benefiting from the Blue and White Nile rivers.
• Modern irrigation techniques have transformed the area into a highly productive agricultural zone.
• The Ghezira scheme serves as a historical model for irrigation practices in arid regions.
• Other options, while having agricultural activities, do not match the significance of the Ghezira Plains in terms of irrigation agriculture.