In each row the arrow turns while its colour stays the same. Which arrow is missing from the grid?

Along every row the arrow turns $45^{\circ }$ clockwise (up, upper-right, right in the top row). The bottom row is yellow and goes right, lower-right, so it ends pointing straight down: (a). (b) turns back, (c) is the right direction in the wrong colour and (d) turns $90^{\circ }$ instead of $45^{\circ }$.