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This isn't a test – it's a weak riddle, "Guess your answer to each question!"
But, thanks to it, I finally made up my mind. Definitely Barbarian! Fortress, Stronghold... Whatever you call it. :)
The main thing is strength and rapid development of attacking units.
Hmm, actually, Fortress and Stronghold are completely different castles in every way. It seems the riddle isn't that simple, or you're not understanding something.