Find the rule along the rows and the rule down the columns. Which figure is missing from the grid?

Along every row the arrow turns $90^{\circ }$ clockwise from one cell to the next (up, right, down; left, up, right). Down every column the number of dots stays the same: 1 in the first column, 3 in the middle, 2 in the last. In the bottom row the arrow points up-right, so the missing arrow points down-right, with 3 dots: (b). (a) takes the dots from a neighbouring cell, (c) turns the arrow anticlockwise and (d) copies the arrow of the last cell.