If in a code MIND becomes KGLB and ARGUE becomes YPESC. Then what will DIAGRAM be in that code?

BGYEPYK

1) MIND becomes KGLB;

M -> (-2) -> K

I -> (-2) -> G

N -> (-2) -> L

D -> (-2) -> B

And, ARGUE becomes YPESC;

A -> (-2) -> Y

R -> (-2) -> P

G -> (-2) -> E

U -> (-2) -> S

E -> (-2) -> C

Similarly,

D -> (-2) -> B

I -> (-2) -> G

A -> (-2) -> Y

G -> (-2) -> E

R -> (-2) -> P

A -> (-2) -> Y

M -> (-2) -> K

Thus, BGYEPYK is correct.