A : B :: C : ? Two changes turn A into B. Which answer figure completes the analogy?

From A to B the whole figure turns $90^{\circ }$ clockwise (the half-circle moves from top-left to top-right and the triangle from bottom-right to bottom-left) and every orange part becomes white while every white part becomes orange. Doing both to C gives (b). (a) only turns, (c) turns anticlockwise and (d) is a mirror image.