Answer:
Ornamentation found in some other styles of furniture design, such as scrollwork, inlays, or carved forms, was absent in the Bauhaus style. The color palette used in Bauhaus furniture also tended to be simple. Prints, patterns, and bright colors were rare.
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answer: A - the real emotions inside all humans.
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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