Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the right order to form a meaningful and coherent paragraph.
A. Games involved gladiators fighting wild animals or each other.
B. Inside, tiered seating encircled the arena, where animals were caged and stage sets prepared.
C. Inaugurated in AD 80, the 50,000-seat Colosseum is also known as the Flavian Amphitheatre.
D. Rome’s great gladiatorial arena is the most monumental of the city's ancient sights.