The correct option is A President of India on the advise or resignation of Prime Minister
The Lok Sabha usually dissolves after the Completion of its term. But the President is empowered to dissolve the Lok Sabha on the advise of the Prime Minister or on the condition of resignation of the Prime Minister. When Prime Minister offers his resignation then all the ministers lose their confidence in the parliament and hence it is dissolved by the President. Once Lok Sabha is diddolved before the completion of its normal tenure, the dissolution is irrevocable.