Which plan (a) to (d) shows the squares covered by this arrangement when it is viewed from directly above? The front edge of each plan is at the bottom.

From above, every square with at least one cube is covered. Back row: cubes on the left and right, gap in the middle. Middle row: left and middle covered. Front row: all three covered. That is plan (d). (a) is upside down, (b) is a mirror image and (c) leaves out a front cube.