What type of writing system did Egyptians use for religious and official documents?

The Egyptians utilized hieroglyphics for religious and official documents, making it the correct choice. This writing system is characterized by its use of pictorial symbols to represent objects, ideas, and sounds, allowing for complex and artistic expression. Hieroglyphics were integral to the administration of the state and played a significant role in religious contexts, such as inscriptions on temple walls, tombs, and monuments, where they conveyed prayers, rituals, and the names of deities.

Hieratic, while also an Egyptian script used for writing, was more commonly employed for everyday purposes and on papyrus. Cuneiform is a writing system used by the ancient Sumerians and other Mesopotamian cultures, not Egyptians. Linear B was used for writing Mycenaean Greek, distinct from the Egyptian civilization. Therefore, the emphasis of hieroglyphics on sacred and formal writing makes it the appropriate answer for this question.