The logic follows here is:
(1) The horizontal line of letters is shifting one step down except the letter which in center of that horizontal line in each step.
● Horizontal line (Alphabetical): Shifts one step below in each step and changes position as shown below. each step, as shown below,
● Thus, only option (1) follows the above conditions where I is changed to X (other character). Therefore, the complete series is:
For Vertical line: From figure 2 to figure 6;
● 1) The number 1 is repeated 3 times and a new letter U is repeated 3 times.
● 2) The number 2 is repeated 4 times and a new letter T is repeated 2 times.
● 3) The letter I is repeated 5 times and a new letter X is repeated 1 time.
● 4) The number 3 is repeated 1 time and a new letter A is repeated 5 times.
● 5) The number 4 is repeated 2 times and a new number 6 is repeated 4 times.
Hence,
option (1) is the correct answer.