Correct Option: B

The evidence of water tax is proivided by the inscriptions of gahadavalas occupy a very important place in India history,They ruled for over a century (AD1080-1097), over a vast region of North India ,which extended from the western bank of Yamuna in the west to patna Monnghyr and Bodhgaya in Bihar in the east It extended from the foothills of the Himalayas in the noth to Beghelkhanda in Madhya Pradesh in the south.