The correct answer is: A. Article 161.
Article 161 of the Constitution of India deals with the powers of the Governor of a State. It states that the Governor of a State shall have the power to grant pardons, reprieves, respites, remissions, commutations of punishment or to suspend, remit or commute the sentence of any person convicted of any offence against any law relating to a matter to which the executive power of the State extends.
The other options are incorrect because they do not deal with the powers of the Governor of a State. Article 167 deals with the appointment of the Chief Minister and other Ministers of a State. Article 163 deals with the summoning and proroguing of the State Legislature. Article 151 deals with the appointment of the Advocate General of a State.