The correct answer is option 1: Punjab. The Ghadar party, which was formed in the USA, aimed to initiate a revolt in India. They chose the province of Punjab as the starting point for their armed revolt.

Option 2: Bengal is incorrect as the Ghadar party did not choose Bengal as the province to begin their revolt.

Option 3: United Provinces is also incorrect as the Ghadar party did not choose this province for their armed revolt.

Option 4: Bihar is also incorrect as the Ghadar party did not choose Bihar as the province to begin their revolt.

It is important to note that the Ghadar party was a revolutionary organization established by Indian nationalists in 1913, with the objective of ending British rule in India by any means necessary. They aimed to mobilize Indian soldiers serving in the British Army to rebel against their colonial rulers. The party`s choice of Punjab as the starting point for their revolt was strategic, as Punjab had a significant presence of Indian soldiers who could potentially join their cause.