The public work or worship of the Church. It is the participation of the people of God in the 'work of God,' which is our salvation from sin.

• A. Mass
• B. Liturgy
• C. Worship
• D. Sacrament

Answer: (B)

The concept here is the Church’s official, communal worship in which the People of God participate in God’s saving work. That formal, public worship is called liturgy. It names the structured, communal prayers and rites the Church conducts, with the Mass standing as its central celebration and the Liturgy of the Hours as another main part.

Mass is an important example within liturgy, the central act of worship in the Church, but the proper term for the whole framework of public worship is liturgy. Worship is a broader idea of reverence and devotion that can occur privately or in various settings, and a sacrament is a specific sign and instrument of grace rather than the act of public worship itself. So liturgy best fits the description because it captures the official, communal nature of the Church’s work and the People of God’s participation in God’s saving work.