The orange dome moves round the inside of the frame while the star in the middle does not change. Which frame comes next?

Each step the dome moves on to the next side of the frame going clockwise (top, right, bottom, left, top), always with its flat side against the frame and its round side facing the middle. Next it is on the right side, still facing inwards, and the star stays upright: (a). (b) turns the whole picture, star included; (c) moves anticlockwise and (d) jumps two sides at once.