Under the Indian Constitution, which authority holds the power to appoint the Governor of a state?

The correct option is President of India.

Under Article 155 of the Constitution of India, the Governor of a State is appointed by the President of India by warrant under his hand and seal.

Key constitutional facts regarding the appointment of a Governor:
- Appointment & Provision: Article 155 explicitly states that the Governor of a state shall be appointed by the President of India.
- Tenure of Office: As per Article 156, the Governor holds office during the pleasure of the President, with a normal term of office being five years.
- Qualifications: Article 157 lays down that a person must be a citizen of India and must have completed 35 years of age to be eligible for the post of Governor.