Answer;
B. The pyramids at Giza are built
Explanation;
The Great Pyramids of Giza were most likely built during the reign of Khufu (in the fourth dynasty of the Old Kingdom). After Khufu’s reign, the Old Kingdom entered a gradual period of decline. Most of the pyramids built after Khufu’s death were much smaller and less expensive. Especially during the fifth and sixth dynasties.
The Old Kingdom of ancient Egypt declined during the rule of the Fifth and Sixth Dynasties, finally dissolving in the 22nd century BCE. There were several factors that contributed to the decline of the Old Kingdom, but the most important issue was the erosion of the authority of the Pharaoh and the accompanying growing power of the nobility and priesthood. This led to the decentralization of power in Egypt and constant power struggles and civil war.