Explanation:

The Union Public Service Commission (UPSC) is a constitutional body established under the provisions of the Indian Constitution. * **Correct Option (D) Article 315:** Article 315 of the Constitution of India explicitly states that there shall be a Public Service Commission for the Union (UPSC) and a Public Service Commission for each State. This article provides the foundational legal framework for the establishment and functioning of these crucial bodies responsible for recruitment to civil services. * **Incorrect Option (A) Article 122:** Article 122 deals with the jurisdiction of courts regarding proceedings of Parliament, specifically prohibiting courts from inquiring into the validity of any proceedings in Parliament on the ground of any alleged irregularity of procedure. It has no relevance to the establishment of the UPSC. * **Incorrect Option (B) Article 178:** Article 178 pertains to the Speaker and Deputy Speaker of the Legislative Assembly of a State, outlining their election and removal. This article is concerned with state legislative bodies, not the Union Public Service Commission. * **Incorrect Option (C) Article 272:** Article 272, which has since been repealed by the Constitution (Eighty-Eighth Amendment) Act, 2003, previously dealt with taxes on certain services levied and collected by the Union and appropriated by the Union and the States. It was a financial article and bears no connection to the establishment of the UPSC.