Creating Strong Compound-Complex Sentences

What is the correct version of the compound-complex sentence from the provided options?

Albel
Miguel downloaded the music, but the stereo was broken because we wanted to hear him sing.
Miguel downloaded the music because we wanted to hear him sing, but the stereo was broken.
Miguel downloaded the music, but the stereo, because we wanted to hear him sing, was broken.
* Miguel downloaded the music, but, because we wanted to hear him sing, the stereo was broken.

Answer:

B. Miguel downloaded the music because we wanted to hear him sing, but the stereo was broken.

Explanation:

Just an FYI .... Do note that answer A is also a compound-complex sentence. The problem with it is, however, is that it makes no sense.