What did the Nicene-Constantinopolitan Creed add to the original Nicene Creed?

The Nicene-Constantinopolitan Creed, also known as the Nicene Creed, is an extension and clarification of the original Nicene Creed established at the First Council of Nicaea in 325 AD. One of the most significant contributions of the Nicene-Constantinopolitan Creed, adopted at the First Council of Constantinople in 381 AD, was its expanded articulation concerning the Holy Spirit.

This creed not only reaffirmed the divinity of Jesus Christ but also elaborated on the nature and role of the Holy Spirit within the Holy Trinity. It explicitly stated that the Holy Spirit is worshipped and glorified alongside the Father and the Son, emphasizing the Spirit's co-equal status in the Godhead. This addition was essential in addressing the Arian controversy and other theological debates of the time regarding the nature of divinity and the Trinity.

The other options presented do not accurately reflect the primary focus of the Nicene-Constantinopolitan Creed. Definitions of church governance, the inclusion of apostolic succession, and clarifications on the role of Mary were not central to the creed's purpose or content, which was primarily concerned with the nature of God and the relationship between the Father, Son, and Holy Spirit.