A single shaded cell travels clockwise around the outer cells of a grid, moving one cell further at each step than at the step before. Which answer figure continues the series?

Clockwise around the border the shaded cell moves 1, 2, 3 and then 4 cells: top-left → top-middle → middle-right → bottom-left → top-right. The next move is 5 cells: middle-right, bottom-right, bottom-middle, bottom-left, middle-left. So the shading lands on the middle-left cell: (c).