This puzzle can have more then one correct answer !
In fact I have seen THREE answers, but maybe there is even more.
First right ( and most complete ) guess with full explanation (important) , how your answer was derived - will get a prize 3 SBD.
This puzzle is also a TRAP for bots. Steemit users posting comment without your answer to the puzzle, but praising like usual "nice post", "very interesting" etc etc, (so typical to the automatic bots) - will be unfollowed, muted and flagged.
This is one of my numerous attempts (there will be more) to get rid of all the spaming bots from my blog.
Enjoy.
@onealfa