|A) 9836715||B) 9386615|
|C) 9386715||D) 9386517|
If each consecutive letter in "happiness" relates to the consecutive numbers in 517768399, then H=5, A=1, P=7, I=6, N=8, E=3 and S=9.
Using the numbers that relate to the letters in 'senipah', you will arrive at
SENIPAH = 9386715.
Hence, Happiness is to 517768399 as senipah is to 9386715.