The four shapes in A stay in their corners in B, but something else moves. Which answer figure is related to C in the same way?

Each shape keeps its corner, but the colours move one corner clockwise: the orange of the top-left circle passes to the top-right square, blue to the bottom-right triangle, and so on, with violet coming round to the top-left. In C the colours yellow, orange, blue, red move one corner clockwise, giving red, yellow, orange, blue from the top-left: (b). (a) and (c) move the colours wrongly and (d) moves the shapes instead of the colours.