I think the answer is D sorry if wrong
Answer:
Egyptian burial rites
Explanation:
According to the excerpt from The Riddle of the Rosetta Stone, the content of the book seem to index the content of the Stone which contain hieroglyphs, cursive scripts, inscriptions, etc.
The subject to which this book would be the best resource is Egyptian burial rites
Search up facts about the both of their arrests. I mean this is not a really hard question
