In a code language, 'PLUM' is written as ‘KQOMFVNN’. How will 'BIG' be will ‘BIG’ be written in that language?

YCRJTH

1   2    3    4   5    6   7     8    9  10  11  12  13

 A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

**********************************************************

The pattern here is;

 'PLUM' is written as ‘KQOMFVNN’,

P +1 → Q, opposite of P is K

L +1 → M, opposite of L is O

U +1 → V, opposite of U is F

M +1 → N, opposite of M is N

Similarly,

B +1 → C, opposite of B is Y

I +1 → J, opposite of I is R

G +1 → H, opposite of G is T

Thus, YCRJTH is correct.