Find the odd one out.

The correct option is RTV.

To find the odd one out, let us analyze the pattern of positions of the letters in the English alphabet for each option:

1. GIJ:
- Position of G = 7
- Position of I = 9 (+2 from G)
- Position of J = 10 (+1 from I)
Pattern: (+2, +1)

2. TVW:
- Position of T = 20
- Position of V = 22 (+2 from T)
- Position of W = 23 (+1 from V)
Pattern: (+2, +1)

3. CEF:
- Position of C = 3
- Position of E = 5 (+2 from C)
- Position of F = 6 (+1 from E)
Pattern: (+2, +1)

4. RTV:
- Position of R = 18
- Position of T = 20 (+2 from R)
- Position of V = 22 (+2 from T)
Pattern: (+2, +2)

All options except RTV follow the positional jump pattern of (+2, +1). Therefore, RTV is the odd one out.