The correct answer is: The Brahmaputra system and the Irrawaddy-Chindwin system (Myanmar).
The Brahmaputra is the largest river in India and the third largest river in Asia. It originates in the Himalayas in Tibet and flows through India and Bangladesh before emptying into the Bay of Bengal. The Irrawaddy is the largest river in Myanmar. It originates in the Himalayas in Tibet and flows through Myanmar before emptying into the Bay of Bengal.
The Brahmaputra and the Irrawaddy are both monsoonal rivers, which means that they experience seasonal flooding during the monsoon season. The Brahmaputra is particularly prone to flooding, and has been the site of several major floods in recent years.
The Brahmaputra and the Irrawaddy are both important sources of water for irrigation and drinking water. They are also important for transportation and fisheries.
The other options are incorrect because they do not include the Brahmaputra or the Irrawaddy. The Ganga system is the largest river system in India, but it does not include the Brahmaputra. The Mahanadi system is a river system in central India, but it does not include the Brahmaputra. The Indus system is a river system in northwestern India and Pakistan, but it does not include the Brahmaputra. The Godavari system is a river system in central India, but it does not include the Brahmaputra. The Krishna system is a river system in southern India, but it does not include the Brahmaputra.