The correct options are
A Gandak
B Gomti
The Ganga river system is spread over India, Tibet (China), Nepal, and Bangladesh. It is the largest river basin in India and accounts for about one-fourth of the total area of the country. A few rivers in the Ganga river system are Alaknanda, Ramganga, Kali, Yamuna, Gomti, Ghagra, Gandak, Kosi, Son etc.