Word Pair Analysis:
In this question, we are given a word pair "LGH:KKI" and we need to find the related word pair from the given options. Let's analyze the relationship between the words in the given word pair to find a pattern and apply it to the options.

Pattern Analysis:
To find the pattern between the letters in the word pair "LGH:KKI", we can look at the relationship between each corresponding pair of letters.

- The first letter in the first word, "L", moves one position forward to become "M" in the second word.
- The second letter in the first word, "G", moves one position forward to become "H" in the second word.
- The third letter in the first word, "H", moves one position forward to become "I" in the second word.

Based on this pattern, it seems like each letter in the first word is moving one position forward to become the corresponding letter in the second word.

Applying the Pattern:
Now, let's apply the same pattern to the given word pair "CIA:?" and see which option fits the pattern.

- The first letter in the word "C", moves one position forward to become "D" in the second word.
- The second letter in the word "I", moves one position forward to become "J" in the second word.
- The third letter in the word "A", moves one position forward to become "B" in the second word.

So, the related word pair for "CIA:?" would be "DJB".

Matching the Options:
Now, let's match the related word pair "DJB" with the given options to find the correct answer.

a) CBZ - The second letter in the second word doesn't match the pattern.
b) DBB - The second letter in the second word matches the pattern.
c) BBC - The first letter in the second word doesn't match the pattern.
d) BMB - The second letter in the second word doesn't match the pattern.

Out of the given options, only option "b) DBB" matches the pattern and is the correct answer.

Conclusion:
The correct answer is option "b) DBB" because it follows the same pattern as the given word pair "LGH:KKI".