The correct answer is option 4, Brahmaputra. The Brahmaputra River takes a `U` turn at Nurricha Barwa and enters India. Let`s take a closer look at the other options to understand why they are not the correct answers.
Option 1, Conga, is not a known river and does not exist. This is not the correct answer.
Option 2, `fish, is not a river. It seems to be a typographical error or an incomplete option. This is not the correct answer.
Option 3, Barak, is a river in India, but it does not take a `U` turn at Nurricha Barwa. This river flows through the states of Manipur, Assam, and Nagaland, but it does not enter India by taking a `U` turn at Nurricha Barwa. This is not the correct answer.
Therefore, the correct answer is option 4, Brahmaputra. The Brahmaputra River takes a `U` turn at Nurricha Barwa and enters India. It flows through the northeastern states of Arunachal Pradesh and Assam before merging with the Ganges River in Bangladesh and ultimately emptying into the Bay of Bengal.