/jp/ - Otaku Culture

>A:どうして行かないの？  B:だって、忙しいもの
can i interpret B as "i'm doing something that is busy"? that makes more sense to me than the translation DoJG has given even if they mean the same thing. because when i see もの i translate it as "kind/sort of thing" in my head. but i don't see why もの even needs to be here.