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Certain elements from the Roman civilisation could be one of the main inspirations of the architectural structures of the famous romanesque churches. The romanesque architecture is primarily characterised by having excellent qualities involving large spires and very thick walls.
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
