Final answer:
Centrally planned buildings in Early Christian practice often included a baptistery for the purpose of baptism, an important rite symbolizing spiritual cleansing and initiation into the Christian community.
A is correct
Step-by-step explanation:
The ritual often associated with centrally planned buildings in Early Christian practice is baptism. The architecture of such buildings, including the baptistery, was specifically designed to facilitate the Baptism rite, which was a crucial aspect of Christian life.
Baptism served as the initiation into Christianity, symbolizing the cleansing of the spirit and marking the entry of a new member into the Christian community. A prime example of a building with a central plan that included a baptistery is the Church of San Vitale in Ravenna, Italy, which showcases the importance of the practice within the Christian architectural situation.