Which of these thesis statements is most restricted, precise, and unified?

A)Listening to music can be beneficial for a number of reasons.
B)Coldplay is one of the more popular bands touring today.
C)Downloading music from the Internet saves time and money as well as exposes music lovers to a variety of music genres and artists.
D)The music of Coldplay has been influenced by Echo and the Bunnymen, Kate Bush, and George Harrison.