Final answer:
Option (A), The early Christian church's process of becoming a Christian, called the Catechumenate, took several years and included learning about the faith, instruction, and sacraments like baptism.
Step-by-step explanation:
In the early Christian church, the process of becoming a Christian, also known as the Catechumenate, took several years. This period was marked by learning about the faith, receiving instruction, and engaging in various religious practices.
The Catechumenate was essential for gradual integration into the Christian community, emphasizing the importance of faith formation along with participation in the sacraments such as baptism, communion, and confession, which were core parts of the religious life.