Final answer:
Bach's Brandenburg Concertos consist of six concertos and were written between 1711 and 1721 by Johann Sebastian Bach.
Step-by-step explanation:
The correct answer is C) Six.
Bach's Brandenburg Concertos consist of six concertos. They were composed by Johann Sebastian Bach, a German composer, and are considered some of his most famous and influential works. Each concerto in the collection is unique and showcases Bach's mastery of orchestration and compositional techniques.
Bach composed the Brandenburg Concertos to showcase his skills to Margrave Christian Ludwig of Brandenburg-Schwedt. The concertos were written between 1711 and 1721 and are a significant contribution to the Baroque music period.