The Forbidden City was the result of a two-thousand year old history of classical Chinese and East Asian architecture and exercised great influence on many modern constructions worldwide. The construction of the massive palatial structure began in 1406, lasted 15 years, and required more than a million workers. The Forbidden City, now a museum, stands witness to the currents of changes that swept through China. As its name suggests, The Forbidden City was off limits for the ordinary people because it was an imperial palace from the Ming Dynasty to the end of the Qing Dynasty. The palace was an earthly symbol of the celestial—or heavenly—emperor's residence. Nobody could enter or leave the palace without the emperor's permission. The palace was the home of the emperor and the centerfold of the Chinese politics and ceremonies for five centuries.

Choose the best summary of the passage.
A.
The Forbidden City was significant for the ceremonies the people held there for more than five centuries.
B.
The Forbidden City was so-called because ordinary citizens could not enter or leave the palace at will.
C.
The Forbidden City, an exclusive, imperial palace, was the center of China's political scene for centuries.
D.
The Forbidden City was the earthly residence of the emperor who was regarded as a heavenly figure.