The correct option is D 5
The coded number is the sum of number digits signifying the position of the alphabet in the natural order.
B A D
↓↓↓
2nd 1st 4th i.e., 2 + 1 + 4 = 7
Similarly,
H I S
↓↓↓
8th 9th 19th i.e., 8 + 9 + 19 = 36
further, 3 + 6 = 9
Also,
L O W
↓↓↓
12th 15th 23rd i.e., 12 + 15 + 23 = 50
further, 5 + 0 = 5
Hence, LOW will be coded as 5.