An arrow moves round the outer cells of the grid, jumping the same number of cells each time, and it always points the same way relative to the grid's centre. Which grid comes next?

The arrow jumps 3 outer cells clockwise each time: top-left, middle-right, bottom-left, top-middle. Three more cells clockwise brings it to the bottom-right corner. In every grid it points at the centre cell, so at the bottom-right it points up-left: (d). (b) is in the right cell but points away from the centre, (c) moves anticlockwise and (a) jumps 4 cells.