Answer:
A. Chamber music
Explanation:
Chamber music is a form of classical music that is composed for a small group of instruments—traditionally a group that could fit in a chamber or a small room. An essential characteristic of chamber music results from the limited size of the performing group employed: it is an intimate music, suited to the expression of subtle and refined musical ideas. In the past, chamber music was played by amateur musicians in their homes, today, chamber music is played by both amateur and professional musicians for their own pleasure.