`{:(A,B,C,D,E,F,G,H,I,J,K,L,M),(1,2,3,4,5,6,7,8,9,10,11,12,13),(N,O,P,Q,R,S,T,U,V,W,X,Y,Z),(14,15,16,17,18,19,20,21,22,23,24,25,26):}`
In each of the following questions, four groups of letters are given, three of them are alike in a certain way while one is different. Choose the odd one.

Options

A. ABCD
B. EGIK
C. ACDF
D. CFIL

Answer

To solve the problem, we need to analyze the groups of letters and identify the pattern in their sequences. Let's break it down step by step:

### Step 1: Analyze the Groups
We have four groups of letters:
1. (A, B, C, D, E, F, G, H, I, J, K, L, M)
2. (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
3. (N, O, P, Q, R, S, T, U, V, W, X, Y, Z)
4. (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)

### Step 2: Identify the Patterns
Next, we need to determine how the letters in each group relate to each other:
- **Group 1:** A to B (1 step), B to C (1 step), C to D (1 step), D to E (1 step), E to F (1 step), F to G (1 step), G to H (1 step), H to I (1 step), I to J (1 step), J to K (1 step), K to L (1 step), L to M (1 step). This is a constant step of +1.

- **Group 2:** The numbers increase by +1 each time, which is also a constant step of +1.

- **Group 3:** N to O (1 step), O to P (1 step), P to Q (1 step), Q to R (1 step), R to S (1 step), S to T (1 step), T to U (1 step), U to V (1 step), V to W (1 step), W to X (1 step), X to Y (1 step), Y to Z (1 step). This is a constant step of +1.

- **Group 4:** The numbers increase by +1 each time, which is also a constant step of +1.

### Step 3: Identify the Odd One Out
Now, we need to check the sequences in the options provided:
1. Option 1: (E, G, I, K) - Steps: E to G (+2), G to I (+2), I to K (+2) - Constant step of +2.
2. Option 2: (A, C, D, F) - Steps: A to C (+2), C to D (+1), D to F (+2) - Not a constant step.
3. Option 3: (C, F, I, L) - Steps: C to F (+3), F to I (+3), I to L (+3) - Constant step of +3.
4. Option 4: (A, B, C, D) - Steps: A to B (+1), B to C (+1), C to D (+1) - Constant step of +1.

### Conclusion
From the analysis, we see that:
- Options 1, 3, and 4 have constant steps.
- Option 2 (A, C, D, F) does not follow a constant step pattern.

Thus, the odd one out is **Option 2: (A, C, D, F)**.