choose the correc
they were kasi, kosla, anga, magadha, vajji, malla, chedi, vatsa, kuru, panchala, matsya, surasena, assaka, avanti, gandhara and kamboja.
correct it is a good option the right option is d) 
cornwallis please the right option is d) pure it's better correct option is a) right electrode will increase you should have three choices.

 thanks for the update...i'll check it out. correct answer - joystick the first one.