Musi river is a tributary of which of the following rivers?

Krishna 

The correct answer is Option (4) - Krishna

The Musi River flows into the Krishna River.

Drainage System: The Krishna River has a vast drainage system in the Deccan Plateau of India. It collects water from several tributaries, including the Musi River.

Flow Path: The Musi River originates in the Ananthagiri Hills of Telangana and generally flows eastward. It eventually meets the Krishna River at a place called Vadapally.