Select the figure from among the given options that can replace the question mark (?) in the following series.

Here each square is divided into eight parts which are forming triangles. In these, 'S' is moving.

From the first to the second box, 'S' was moved one step in the anticlockwise direction.

From the third to the fourth box, 'S' was moved one step in the anticlockwise direction.

Similarly, from the fifth to the sixth box, 'S' will be moved one step in the anticlockwise direction.

So as per the above-given logic, option (a) is the correct answer.