Answer:
PART A
Basilicas are characterized by longitudinal building plans, which comprises of an atrium, narthex, portals etc.
The Central Christian churches had a more vertical axis from the center up through the dome.
PART B
The Basilica was seen as the pope's church
The Basilica symbolises the Pope's authority over all Christians.
(1) The Central-plan churches were first used as tombs, they are known with the presence of baptisteries.
(2) The Central-planchurches were built over the graves of Christian martyrs.
Explanation: The Basilica is a special church usually associated with the Roam Catholic church and the Greek Ortodox churches, the basilica is a title conferred on a church building by the pope,it is usually known as the Pope' s church.
Central-plan Christian churches are churches built upon the graves of early Christian martyrs, they are known to contain baptisteries (where people are baptised.