Technically, it only has to embody a nondramatic musical work. I don't think so. After all, what dramatic musical works don't embody some non-dramatic musical content? I think the term "non-dramatic musical work" refers to the stuff of "phonorecords", as distinct from "spoken-voice recordings".
I'm far from an expert in this copyright stuff, but I think we both agree that (B) is inapplicable, although for slightly different reasons. As I read it, (A) is the general exception that says you can turn on your TV in public if it's the type of TV that's common in homes without a commercial sound system and you don't charge anyone to watch it, but (B) basically says if you own a business of a sufficient square footage and your TV happens to play any music, the TV has to be 55 inches or less. If it doesn't, you have to pay ASCAP (which licenses most music). ASCAP both charges
TV stations for the music they play on the air and
commercial establishments if they don't fall within (B) (see #8). Many of the recent copyright laws have been written by and for the benefit of ASCAP.
You and I at home can have any TV system we want as long as we don't invite in strangers, since it's not a public viewing.