The correct option is D 914
The coded number signifies the position of the alphabet in its natural alphabetical series (A = 1, B = 2, C = 3, D = 4, .... ,Z = 26)
O U T → OUT
↓↓↓
15th 21st 20th → 152120
Similarly,
I N → IN
↓↓
9th 14th → 914
Hence, option (D) is the correct answer.