The correct answer is A. Vocal music
Step-by-step explanation:
Barbara Strozzi was a famous composer during the Baroque period in Italy. She was mainly recognized due to her multiple compositions of vocal music or music that is composed to be sung by one or more singers, but especially by one female singer. Moreover, during her time Barbar Strozzi was one of the composers with more volumes of music officially published, and different from other composers most of her music was classified as secular. Thus, Barbara Strozzi is most famous for her compositions of vocal music.