Please Help me with these questions above?!

Which term refers to the assignment of particular instruments to musical passages? a. articulation b. orchestration c. timbre d. dynamics

What does bts stand for? what is the importance of bts? who first started it?

Which of the following best describes program music? a. music written to tell a story. b.music written for a concert. c.music written for tv d.music written to explain tonality