Correct Option: B. 300 sq km Detailed Explanation: To determine the total land area of Nuriki District, we need to rely on geographical data that typically comes from government records, geographical surveys, or academic studies. In this case, the correct answer is stated as 300 square kilometers.

1. Understanding Land Area Measurement:
2. Land area is measured in square kilometers (sq km), which is a unit of area equal to a square that is 1 kilometer on each side. This unit is commonly used in geography to express the size of regions, districts, or countries.
3. Why Option B is Correct:
4. The option B states that the total land area of Nuriki District is 300 sq km. This figure is likely derived from official geographical surveys or census data that provide accurate measurements of land areas. It is essential to rely on credible sources for such data, as inaccuracies can lead to misunderstandings about the size and scope of a geographical area.
5. Why Other Options are Incorrect:
6. Option A (290 sq km): This option is slightly lower than the correct answer. While it may seem plausible, it does not match the recorded data for Nuriki District. It could be a result of outdated information or miscalculation.
7. Option C (310 sq km): This option is higher than the correct answer. It may arise from a misunderstanding of the district's boundaries or an overestimation of the area. Such errors can occur if one includes adjacent areas or misinterprets geographical maps.
8. Option D (320 sq km): This option is the highest and is likely a significant overestimation. It could stem from confusion with a larger neighboring district or a misinterpretation of land use data.
9. Common Pitfalls:
10. Students often confuse the boundaries of districts with those of neighboring areas, leading to incorrect estimations of land area.
11. Relying on outdated or unofficial sources can result in incorrect answers. Always check the most recent and credible data.
12. Misunderstanding the unit of measurement (sq km vs. sq miles) can lead to significant errors in calculations.
13. Visualizing the Area:
14. Imagine a square plot of land that is 17.32 km on each side (since the area of a square is calculated as side length squared: ( \text{Area} = \text{side}^2 )). This visualization helps to understand the size of 300 sq km in a more tangible way.

Revision Summary:

• The total land area of Nuriki District is accurately recorded as 300 sq km.
• Always verify geographical data from credible sources to avoid inaccuracies.
• Be cautious of confusing district boundaries and measurement units.
• Visualizing land area can aid in understanding the size of geographical regions.