What should I write next?

Since I'm kind of busy with RL Serious Business, fiction bunnies are quite predictably tumbling over each other to get out of my head. So, readers, if I only have time to write about one fictional thing in the next week, what should it be?

Option A: Matriarchal world + magic water

Option B: Urban fantasy setting + characters who identify as "failed heroes"

Option C: Elemental powers and their side effects + cultural differences in dealing with the powers and side effects

Option D: Don't just sit there making up new worlds and characters! Write more in one or more of the series that got started forever ago on LJ!