Answer - A. Engraving
Simple Explanation Reason - Why it was difficult is because of learning the technique. Since it was less common then Printmaking used with etching.
Credit Researched - Engraving - Wiki-Pedia
Paper can get lit the fastest. In fact, it can catch on fire in 1 second among contact.
I think it's false because the dark ages are the medieval era/middle ages. So I don't think something can start at the end of itself.
