Explanation:

In the given coding the words are coded as their alphabetical order buit with a little change in it

F---->6

A------>1

S-----> 1 (1=1+9) 

H------> 8

I-------> 9

O-------> 6 ( 6= 1+5)  

N-------> 5 (5=1+4)

Similarly following the same pattern we will get

L----> 3 (3=1+2)

A-------> 1

S--------> 1 (1=1+9) 

T-----> 2 (2= 2+0)

I-----> 9 

N-----> 5 (5=1+4)

G------->7

Hence we see that the codes are just the numbers of the alphabetical orders and so option 3 is the most relative answer.