First Sugar Mill was set up in Bihar at –

The correct answer is A. Marhowrah.

The first sugar mill in Bihar was set up in Marhowrah in 1910. It was a joint venture between the Maharaja of Darbhanga and the British firm of Bird & Co. The mill was initially a success, but it ran into financial difficulties in the 1930s and was eventually closed down in 1939.

The other options are incorrect. Betia is a town in the Champaran district of Bihar. Motihari is a town in the East Champaran district of Bihar. Patna is the capital of Bihar.