The Manipur River flows through the state and is a tributary of the:

Chindwin River (Myanmar)
Brahmaputra River
Barak River
Teesta River

The correct answer is the Barak River.

The Manipur River is a river in India that flows through the state of Manipur. It is a tributary of the Barak River, which in turn is a tributary of the Brahmaputra River. The Manipur River is about 200 kilometers long and its drainage basin covers an area of about 10,000 square kilometers. The river originates in the Manipur Hills and flows eastwards before joining the Barak River near Silchar in Assam. The Manipur River is an important source of water for irrigation and drinking water in Manipur. It is also a popular destination for fishing and boating.

The Chindwin River is a river in Myanmar that flows through the states of Sagaing and Chin. It is a tributary of the Irrawaddy River. The Chindwin River is about 1,200 kilometers long and its drainage basin covers an area of about 100,000 square kilometers. The river originates in the Kachin Hills and flows southwards before joining the Irrawaddy River near Mandalay. The Chindwin River is an important source of water for irrigation and drinking water in Myanmar. It is also a popular destination for fishing and boating.

The Brahmaputra River is a river in Asia that flows through the countries of China, India, and Bangladesh. It is the longest river in India and the third longest river in Asia. The Brahmaputra River is about 2,900 kilometers long and its drainage basin covers an area of about 930,000 square kilometers. The river originates in the Himalayas and flows eastwards through Tibet and India before entering Bangladesh. The Brahmaputra River is an important source of water for irrigation and drinking water in India and Bangladesh. It is also a popular destination for fishing and boating.

The Barak River is a river in India that flows through the states of Manipur, Assam, and Tripura. It is a tributary of the Brahmaputra River. The Barak River is about 500 kilometers long and its drainage basin covers an area of about 20,000 square kilometers. The river originates in the Manipur Hills and flows eastwards before joining the Brahmaputra River near Karimganj in Assam. The Barak River is an important source of water for irrigation and drinking water in the states of Manipur, Assam, and Tripura. It is also a popular destination for fishing and boating.