The correct answer is: A. Article 320.
Article 320 of the Indian Constitution deals with the Public Service Commissions. It states that there shall be a Public Service Commission for the Union and for each State. The Commissions shall be constituted by the President and shall consist of a Chairman and such number of other members, not exceeding six, as the President may deem fit.
The duties of the Union Public Service Commission are to conduct examinations for appointments to the services of the Union and advise the Government on matters relating to appointments to such services. The duties of the State Public Service Commissions are to conduct examinations for appointments to the services of the State and advise the Government on matters relating to appointments to such services.
The Himachal Pradesh Public Service Commission is a State Public Service Commission constituted under Article 320 of the Indian Constitution. It is responsible for conducting examinations for appointments to the services of the State of Himachal Pradesh and advising the Government on matters relating to appointments to such services.
The other options are incorrect because they do not deal with the Public Service Commissions. Article 325-3 deals with the appointment of judges of the Supreme Court and the High Courts. Article 330 deals with the representation of the States in the Council of States. Article 335 deals with the special provision for the advancement of certain classes of citizens.