Question Type: General Knowledge

This question tests knowledge of geographical facts, specifically the length of the Mahanadi river. There's no logical reasoning or pattern to solve; it requires recalling the information.

Step-by-step Solution:

1. The question asks for the total length of the Mahanadi River.
2. The correct answer is 851 km.
3. Option 1 (351 km), Option 2 (567 km), and Option 3 (200 km) are incorrect as they do not represent the actual length of the Mahanadi River.

Core Logic/Pattern: This question relies on factual recall. There is no pattern or logical deduction involved.

Eliminating Incorrect Options: The incorrect options are incorrect because they are significantly shorter than the actual length of the Mahanadi River. These lengths likely represent the length of other smaller rivers or are simply incorrect data.

Therefore, the correct answer is 851 km.