Final answer:
The correct answer is Basilicas. They were large rectangular buildings used for various civic and juridical purposes in ancient Rome. Originally constructed by the Romans, the form of basilicas was later appropriated for Christian worship.
Step-by-step explanation:
The correct answer is A) Basilicas. Basilicas were large rectangular buildings used for various civic and juridical purposes in ancient Rome. They served as audience halls, law courts, and meeting places for conducting business transactions. Originally constructed by the Romans, the form of basilicas was later appropriated for Christian worship and many churches still maintain this basic shape today.