Question 4

Convert each letter to its position in the English alphabet (A = 1, B = 2, ..., Z = 26):

1. Option (A) CADBE:
   Positions: C (3), A (1), D (4), B (2), E (5)
   Successive differences:
   $$1 - 3 = -2$$
   $$4 - 1 = +3$$
   $$2 - 4 = -2$$
   $$5 - 2 = +3$$
   Difference pattern: $(-2, +3, -2, +3)$.

2. Option (B) JHKIL:
   Positions: J (10), H (8), K (11), I (9), L (12)
   Successive differences:
   $$8 - 10 = -2$$
   $$11 - 8 = +3$$
   $$9 - 11 = -2$$
   $$12 - 9 = +3$$
   Difference pattern: $(-2, +3, -2, +3)$.

3. Option (C) XVYWZ:
   Positions: X (24), V (22), Y (25), W (23), Z (26)
   Successive differences:
   $$22 - 24 = -2$$
   $$25 - 22 = +3$$
   $$23 - 25 = -2$$
   $$26 - 23 = +3$$
   Difference pattern: $(-2, +3, -2, +3)$.

4. Option (D) ONPMQ:
   Positions: O (15), N (14), P (16), M (13), Q (17)
   Successive differences:
   $$14 - 15 = -1$$
   $$16 - 14 = +2$$
   $$13 - 16 = -3$$
   $$17 - 13 = +4$$
   Difference pattern: $(-1, +2, -3, +4)$.

Options (A), (B), and (C) strictly follow the alternating step pattern $(-2, +3, -2, +3)$, whereas option (D) does not.

Therefore, ONPMQ is the odd one.