Music appreciation the romantic era     was of utmost importance in romantic german opera.  a.  form      b.  naturalism      c.  mood      d.  realism

The best answer is C) Mood

The German Opera employed a strong sense of nationalism and a heavy emphasis on the natural world (although not naturalism, which is based more on a empirical analysis of the world devoid of the supernatural). In German Opera, mood and the feelings created by the piece were of utmost importance. 

Cis the answer for the question you asked