Figure A is changed into figure B by a rule. Apply the same rule to figure C. Which answer figure replaces the question mark?

A turns into B by a quarter turn $(90^{\circ })$ clockwise: the right angle moves from bottom-left to top-left and the dot from the top-right to the bottom-right. Turning the flag $90^{\circ }$ clockwise lays the pole flat with the stand on the left and the flag hanging down on the right: (c). (a) turns anticlockwise, (b) is a mirror image and (d) a half-turn.