【单选题】
A、Kings and queens, princes and princesses, and lords and ladies built castles in order to get more lanD、B.Around the outside of a castle, a moat was dug, which was often filled with water.C.A、castle was built behind a thick and high stonewall, which was strong enough to stand the possible attack of enemies.D.If a drawbridge was pulled up, there was no way for people to enter the castle.