The correct answer is A. Governor.
The Governor is the head of the state in a parliamentary system of government. He/She is appointed by the President of India on the advice of the Central Council of Ministers. The Governor has the power to appoint the Chief Minister of the state. The Chief Minister is the leader of the party or coalition of parties that has the majority of seats in the Legislative Assembly. The Governor appoints the Chief Minister after consulting the leaders of all the political parties in the state.
The Speaker of the Legislative Assembly is the presiding officer of the Legislative Assembly. He/She is elected by the members of the Legislative Assembly. The Speaker does not have the power to appoint the Chief Minister.
The Chairman of the Legislative Council is the presiding officer of the Legislative Council. He/She is elected by the members of the Legislative Council. The Chairman does not have the power to appoint the Chief Minister.