The correct answer is: C. 54
The First Delimitation Commission was constituted on 24th January 1966 to demarcate the parliamentary and assembly constituencies in the newly created state of Haryana. The Commission submitted its report on 31st November 1966, recommending that Haryana should have 54 seats in the Lok Sabha and 90 seats in the Vidhan Sabha.
Option A is incorrect because it is the number of seats that Haryana had in the Lok Sabha before the formation of the state.
Option B is incorrect because it is the number of seats that Haryana had in the Vidhan Sabha before the formation of the state.
Option D is incorrect because it is the total number of seats in the Lok Sabha and the Vidhan Sabha of Haryana before the formation of the state.