Option 1 states that massive demonstrations were held in Bengal during the Swadeshi movement in 1905. This statement is true, as the Swadeshi movement involved widespread protests and demonstrations against the British rule in Bengal.

Option 2 states that a Hartal was observed in Calcutta during the Swadeshi movement. This statement is also true, as Hartal refers to a form of non-violent protest where people go on strike and businesses shut down as a mark of solidarity. This was indeed observed in Calcutta during the Swadeshi movement.

Option 3 states that the movement was initiated by the moderates but was taken over by the revolutionary nationalists at a later stage. This statement is also true. Initially, the Swadeshi movement was started by the moderates, who advocated for indigenous industries and boycotting of foreign goods. However, as the movement gained momentum and became more radical, it was taken over by revolutionary nationalists who aimed for complete independence from British rule.

Therefore, all three options are true in the context of the Swadeshi movement in 1905.