Which is the highest river basin of Peninsular India

The correct answer is Option C: Krishna
Let's understand why:

* River Basin: A river basin is the area of land drained by a river and its tributaries (smaller streams that feed into it).
* Peninsular India: This refers to the part of India that juts out into the Indian Ocean, south of the Indo-Gangetic Plain.
* Highest River Basin: Here, "highest" doesn't mean the river itself is at the highest altitude. It means that among the major peninsular rivers, the Krishna river basin has the largest portion of its area at a higher average elevation than the other rivers mentioned.

Now let's look at the options:

* A: Mahanadi: While a significant river, its basin isn't as elevated overall as the Krishna.
* B: Godavari: The Godavari is a large river, but the Krishna basin has a greater portion at a higher elevation.
* C: Krishna: The Krishna river basin has a considerable part located on the Deccan Plateau, which is at a relatively high elevation. This makes it the highest river basin among the options.
* D: Narmada: The Narmada flows through a relatively lower elevation compared to Krishna's Deccan Plateau region.

Therefore, the Krishna river basin is considered the highest because a large part of its basin lies on the elevated Deccan Plateau.