Explanation: River Kaveri is one of the major rivers in South India, flowing through Karnataka and Tamil Nadu.

Its main tributaries include:

Bhavani

Amravati

Kabini

Hemavati, Noyyal, and Arkavathi


Vaigai River, on the other hand, is not a tributary of Kaveri.

It flows separately through Tamil Nadu, mainly in Madurai and other southern districts.

It originates from the Varusanadu Hills in the Western Ghats.



Other Options Explained:

(A) Bhavani – A major tributary of the Kaveri, joining it near Erode.

(B) Amravati – Another important tributary, flowing from Tamil Nadu.

(C) Kabini – A significant tributary of the Kaveri, originating in Kerala.


Thus, the correct answer is (D) Vaigai.