I'd say, C. I think blogging is probably good for you. I think doing NaNoWriMo, while not for everyone, might give you the focus and the achievable target needed to give the SAD a kicking for a while. However in the same vein, I'm not sure writing a load of negative posts about the woes of your work/govt targets/etc will do much to lift your mood, and I'm not sure dystopian fiction that is upsettingly close to reality will help much either. I don't think magical creatures really belong on this blog but I know you've got several others where it would be more appropriate. No matter what you choose, there's nothing to stop you writing one or more posts on the other options if that's what you want to write - eg focusing on the magical creatures for NaNoWriMo, but popping back on here to write a post that is a normal post for this blog when something mindbendingly stupid or heartwarmingly lovely happens at work. Personally, I've got to do another one of those DLA renewal forms which will keep me writing for most of the month. Last time it weighed in at 26,019 words, or 48 typed pages. You'll forgive me if I don't publish my answers in blog form...