the growing power of the nobility and the priesthood

agricultural failure and climate change

foreign invasion

epidemic and poor public health

religious schism

Egypt experienced a prolonged period of economic decline towards the end of the Old Kingdom.

The known-reserves of limestone and marble were exhausted during the waning years of the fifth dynasty.

As a result of the loss of knowledge caused by the massacre of the Theban population by Nubian raiders.

As a result of the loss of knowledge caused by the massacre of the Memphite population by Libyan raiders.

Because Egypt was occupied by foreign invaders who did not believe in the necessity of tomb construction.

experienced a steady decline and political destabilization

experienced a prolonged Golden Age

constructed the great stone pyramids

was conquered by the Persian Empire

experienced a massive population growth

The pyramids built after Khufu’s reign were much smaller.

The pyramids built after Khufu’s reign were much bigger.

After Khufu’s reign, pyramids stopped being built until the Middle Kingdom.

After Khufu’s reign, architects began using limestone for pyramid construction.

None of these answers are accurate; there was no notable change after Khufu’s reign.