Which of the following research topics is too broad?
a. the music industry has a long and colorful history and includes many types of companies and professionals who create, market, and sell music of all genres. b. record labels first rose to prominence in the mid-twentieth century and became the largest player in the music business; today, they have less importance in the industry.
c. the life of a rock band's tour manager can be challenging and sometimes difficult, but it is never dull.
d. with the emergence of the internet and digital media files, consumers and music lovers now have immediate access to music made by artists around the world.