Count the shapes in each cell and look at what kind they are. Which cell completes the grid?

Each row uses only one kind of shape (stars, hearts, hexagons), and along every row the cells hold 1, 2 and 3 shapes. The bottom row is the hexagon row, so its last cell holds 3 hexagons: (c). (a) has only 2, (b) uses hearts and (d) has 4.