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Hey there! :)
The Egyptians filled papyrus (their kind of "paper", derived from a plant) with info about history, astronomy, and other topics indeed.
Scribes used them for records for most things, including the pharoah, therefore B is also correct.
Hieroglyphics were used only for sacred purposes, therefore, C is also correct.
For the next one, everything about pharaohs were recorded, but usually not exploits, considering the pharaoh needed to be looked high upon.
Lastly, since they were sacred, hieroglyphics where not used by average people.
Hope this helps!