Find the odd one out.

The correct option is DGL.

To find the odd one out, let us analyze the pattern of positional values of the letters in the English alphabet (A = 1, B = 2, C = 3, ..., Z = 26) for each option:

1. BEI:
B = 2, E = 5, I = 9
Difference: 5 - 2 = +3, and 9 - 5 = +4.

2. CFJ:
C = 3, F = 6, J = 10
Difference: 6 - 3 = +3, and 10 - 6 = +4.

3. SVZ:
S = 19, V = 22, Z = 26
Difference: 22 - 19 = +3, and 26 - 22 = +4.

4. DGL:
D = 4, G = 7, L = 12
Difference: 7 - 4 = +3, but 12 - 7 = +5.

All options except DGL follow the pattern of adding 3 to the first letter to get the second letter, and adding 4 to the second letter to get the third letter (+3, +4). DGL follows a pattern of (+3, +5), making it the odd one out.