Final answer:
Full membership in the Church is achieved through the Sacrament of Initiation, which involves Baptism, Communion, and Confirmation. These are significant spiritual rituals within the Catholic faith, denoting serious life stages that conform believers closer to the Church.
Step-by-step explanation:
We become full members of the Church through the Sacrament of Initiation. This includes several significant stages marked by specific sacraments including Baptism, which is believed to purge original sin; Communion, representing a spiritual connection with God through the ritual of the Last Supper and the belief in transubstantiation; and Confirmation, which is the pledge to be a faithful member of the Church taken in young adulthood.
Each of these stages is an important aspect of the Christian faith, particularly within the Catholic tradition, where the sacraments are seen as essential spiritual rituals conducted by ordained priests. These rites help to structure the life of the believers from birth to death, embedding the Church's presence at every major milestone of life. By participating in these rituals, individuals deepen their affiliation with the Church and their community.
Therefore, the correct answer to the question is A) Sacrament of Initiation.