The correct option is C MY CAT IS SLEEPING
25 will be decoded as Y
Thus, first word will be 'MY'
1 will be decoded as A
20 will be decoded as T
Thus, second word will be 'CAT'
9 will be decoded as I
Thus, third word will be 'IS'
19 will be decoded as S
5 will be decoded as E
9 will be decoded as I
14 will be decoded as N
Thus, last word will be 'SLEEPING'
Hence, the phrase will be decoded as "MY CAT IS SLEEPING"