Each step the arrow moves one cell in the direction it is pointing and then turns a quarter turn clockwise. Which grid comes next?

From the centre the arrow points up, moves up and turns to point right; moves right and turns to point down; moves down and turns to point left. Now it moves left, back into the centre, and turns to point up: (a). (b) moves two cells, (c) moves but does not turn and (d) turns without moving.