Correct Answer:

Solution : In the given figure, the following pattern is being followed –
1. In each alternative box that is in box 2 and box 4 a new letter or number is introduced in the centre of the box.
2. The element U changed its position from right to left and left to right alternately in each box.
3. Each element changed its position by following the same pattern in each alternative box as shown –
So following the above pattern, the required figure will be –

Therefore the first option figure will complete the series. Hence, the first option is correct.