Explanation:

- The given series is J_ _ G_ KP_ _ _ PGJ.

- We need to fill these blanks with a combination of letters to complete the pattern.

- Let's evaluate each option:

1. Option 1: GJPKJK

- Filling the blanks: J G J G K P J K J P G J

- No discernible pattern or repetition with this option.

2. Option 2: PJKGJK

- Filling the blanks: J P J G K P G J K P G J

- Disrupted sequence with no clear pattern.

3. Option 3: KPJGJK

- Filling the blanks: J K P G K P J G J K P G J

- Forms a consistent recurring pattern: J K P G.

- 4. Option 4: KJPGKJ

- Filling the blanks: J K J G K P G J K P G J

- No consistent pattern is evident.

- Considering the above evaluations, Option 3: KPJGJK completes the series logically.

- Answer: Option 3: KPJGJK