Pattern Analysis:
To solve this analogy, we need to identify the pattern between the given pair of words (CJDL and FMGR) and apply the same pattern to find the missing pair of words.

Pattern in the given pair:
If we observe the given pair of words (CJDL and FMGR) closely, we can notice that each letter in the first word is shifted one position forward in the English alphabet to get the corresponding letter in the second word. Let's break down the pattern for better understanding:

- C (3rd letter in the alphabet) is shifted one position forward and becomes D (4th letter).
- J (10th letter) is shifted one position forward and becomes K (11th letter).
- D (4th letter) is shifted one position forward and becomes E (5th letter).
- L (12th letter) is shifted one position forward and becomes M (13th letter).

Therefore, the pattern in the given pair is that each letter is shifted one position forward in the English alphabet.

Applying the pattern:
Now, let's apply the same pattern to the letters in the given word 'IKJR' to find the missing word.

- I (9th letter) shifted one position forward becomes J (10th letter).
- K (11th letter) shifted one position forward becomes L (12th letter).
- J (10th letter) shifted one position forward becomes K (11th letter).
- R (18th letter) shifted one position forward becomes S (19th letter).

Hence, the missing pair of letters is 'LSMT'.

Answer:
Therefore, the correct answer is option 'C' - LSMT.