Because of his imperial connections and German birth
Because he retired
Because of a scandal
Because he moved abroad
Answer
Offenbach lost favor in Paris in 1870 because of his imperial connections and German birth. He was born in Cologne, Germany, and his music was often associated with the German Empire, which was at war with France at the time. Offenbach's operettas were also seen as frivolous and decadent, which did not appeal to the French public in the midst of a war.
The Musical Brilliance of Jacques Offenbach: An Engaging Quiz on the Life and Works of the French Composer!