Source A: Description of Giza Pyramids

'The Giza plateau is home to the most famous pyramids of Egypt, built during the Fourth Dynasty of the Old Kingdom. These pyramids served as tombs for the pharaohs Khufu, Khafre, and Menkaure.' Provenance: Ancient Egypt archaeological records, 20th century.

Source B: Timeline of Pyramid Construction

'The construction of Khufu's pyramid began around 2580 BC and took approximately 20 years to complete. Khafre's pyramid followed, around 2550 BC, and Menkaure's around 2530 BC.' Provenance: Egyptology scholarly sources, 21st century.

Source C: Significance of the Pyramids

'The pyramids were not only tombs but also a demonstration of the pharaoh's divine authority and Egypt's religious beliefs. They were meant to ensure the pharaoh’s safe passage to the afterlife.' Provenance: Ancient Egyptian religious texts, translated, 19th century.

Arrange the following events in chronological order:

1. Construction of Menkaure's pyramid begins
2. Construction of Khufu's pyramid begins
3. Khafre's pyramid is completed
4. Reign of Khufu

Write the correct order and briefly explain each event.