Explanation:

Let’s break it down:

- The series is: F I R _ D F _ _ E D F _ T _ D F I _ E _

- Notice the repeating chunk: “F _ _ E D” happens every time after some letters, and then “F _ T _ D”.

- So if you split, it’s:

1. F I R _ D

2. F _ _ E D

3. F _ T _ D

4. F I _ E _

- Each “set” starts with F, ends with D, and usually E shows up right before D after some blanks.

- Every sequence uses I, R, S, E, T, J, U in different positions, and you have to figure out which make the pattern keep repeating.

Now, let’s look at the options line by line:

Option 1: E I S I E U D

- Plugging this in: F I R E D F I S E D F I T E D F I S E D (but this doesn't match the original sequence of blanks, which are at different positions).

Option 2: E G S J E U E

- Plug it: The letter G, J don’t fit into the visible pattern. The original series doesn’t hint at these.

Option 3: E H S I E U D

- Plug it: The H doesn’t match the flow, same problem as above.

Option 4: E I S I E U E

- This one matches the expected pattern.

- F I R E D, F I S E D, F I T E D, F I S E D. All the blank slots are filled sensibly.

- It fits both "F I R _ D", "F I S _ D", and follows the recurring structure.

So, what this really means is:

Option 4 is the best fit.