In the following question, select the figure which can be placed at the sign of question mark(?) from the given alternatives.

From one box to another box, the filled part in the big circle is moving anticlockwise direction.

As per the above logic, options (c) and (d) can be eliminated.

In the first box, four small circle are filled. In the second box, three small circle are filled. In the third box, two small circle are filled.Similalry, in the fourth box, one small circle is filled. Each of the box has four small circle. By this option (b) can be eliminated.

Hence opton (a) is the correct answer.