The correct answer is option 2: Bihar. The Rajya Sabha is the upper house of the Parliament of India, and each state in India is represented by a certain number of seats in the Rajya Sabha. The number of seats allocated to each state is determined by various factors, including population size and other considerations.

In this case, Bihar has the largest number of seats among the given options. It is important to note that the number of seats can change over time due to various factors, such as population changes and reorganization of states. However, as of the time the question was asked, Bihar had the largest number of seats in the Rajya Sabha among the options given.

It is always advisable to check the latest numbers and data to ensure accuracy, as these things can change over time.