The correct option is B the whole Council of Ministers has to resign
A vote of 'no confidence' is not passed against a person. it is passed against the government. India follows the principle of collective responsibility. If the government falls or the Prime Minister resigns, all ministers have to resign. if a vote of no confidence is passed in the Lok Sabha, the government falls and the President calls for a floor-test of majority, the whichever party or alliance has the required numbers, forms a new government.