Between "The Devil and Kate" and "Martha" which has more acts?
Martha (opera) Martha, oder Der Markt zu Richmond ("Martha, or The Market at Richmond") is a "romantic comic" opera in four acts by Friedrich von Flotow set to a German libretto by Friedrich Wilhelm Riese and based on a story by Jules-Henri Vernoy de Saint-Georges.
Anyuta Anyuta (Russian: Аню́та ) is a one-act comic opera to a libretto by Mikhail Popov. First performed in 1772, it was one of the first operas written in the Russian language.