The correct answer is D. Governor of a State.
The Governor of a State is the head of the State and is responsible for appointing the District Judges. The Governor appoints the District Judges on the recommendation of the High Court. The High Court sends a list of names to the Governor, who then selects the person to be appointed as the District Judge.
The Chief Minister of a state does not have the power to appoint the District Judges. The State Public Service Commission is responsible for conducting the examinations for the recruitment of civil servants, but it does not have the power to appoint the District Judges. The Judge of High Court is also not responsible for appointing the District Judges.
The District Judge is the highest judicial officer in a district. He/She is responsible for the administration of justice in the district. The District Judge also has the power to try cases involving serious crimes.