Answer:
The Egyptians showed their knowledge of astronomy in that they developed a calendar.
Explanation:
The building of the pyramids and their meaning and usage is still heavily debatable, so we can not take this option as correct per se.
The development of the calendar is correct because it was based directly on the knowledge of astronomy and the movement patterns of the space objects.
The medical textbooks have been a product of the development of medicine, so it is not a correct option.
The embalming was a process used for the passed away nobles in order to prepare them for the afterlife, so it is not correct.
