Study the rows and the columns of the $3\times 3$ grid. Which answer figure fits in the empty cell?

Along each row the shape stays the same (triangles, squares, pentagons); down each column the colour stays the same (white, yellow, orange). The empty cell is in the pentagon row and the orange column, so it holds an orange pentagon: (c). (a) has the colour of the middle column, (b) the shape of the middle row, and (d) adds a side.