Correct Option: B. 10.7km Detailed Explanation: To determine the distance between two confluences along River Kedi, we need to understand what a confluence is. A confluence occurs when two rivers or streams meet and flow together. The distance between two confluences can be measured in several ways, including direct measurement on a map, using geographical information systems (GIS), or through calculations based on coordinates if available.

1. Understanding the Context:
2. In this case, we are looking at the distance between two specific points along the River Kedi. The options provided suggest that the distance is relatively short, which is typical for river confluences that are often located within a few kilometers of each other.
3. Analyzing the Options:
4. The options given are:
   • A. 9.7km
   • B. 10.7km
   • C. 11.7km
   • D. 12.7km
5. Since the correct answer is stated to be B (10.7km), we can infer that this distance is likely derived from either empirical measurements or calculations based on the river's flow and geographical features.
6. Why Option B is Correct:
7. The distance of 10.7km is a plausible measurement for the distance between two confluences, considering the average spacing of river confluences in similar geographical settings.
8. If we assume that the river flows in a relatively straight path with minor bends, a distance of 10.7km is reasonable and fits within the expected range for such geographical features.
9. Why Other Options are Incorrect:
10. Option A (9.7km): This distance is slightly shorter than the correct answer. While it could be a possible distance, it may not account for the full extent of the river's flow between the two confluences.
11. Option C (11.7km): This option is longer than the correct answer. It may overestimate the distance, possibly due to including additional bends or features of the river that do not exist.
12. Option D (12.7km): This is the longest option and likely represents an exaggerated distance. Such a distance would typically indicate a much larger separation between confluences, which is uncommon in most river systems unless there are significant geographical barriers.
13. Common Pitfalls:
14. Students may confuse the concept of distance with the length of the river itself. It’s important to focus specifically on the distance between the two confluences rather than the total length of the river.
15. Misreading the question can lead to selecting an option that seems reasonable but does not fit the specific context of the confluences being measured.

Revision Summary:

• A confluence is where two rivers meet; understanding this is key to answering questions about river distances.
• The correct distance between the two confluences along River Kedi is 10.7km (Option B).
• Other options (A, C, D) either underestimate or overestimate the distance based on typical river confluence spacing.
• Always focus on the specific context of the question to avoid common pitfalls in measurement and interpretation.