Which sentence uses possessive personal pronouns correctly?
a. his's relatives should arrive soon.
b. the store closed it's doors yesterday.
c. the letter from the post office is her's.
d. their dog is the same breed as ours.

Option 'A' is wrong because his's doesn't make any sense. 
Option 'B' is wrong as well becuase 'it's' should be 'its'.
Option 'C' is also wrong because it should be 'hers'/
Option 'D' is correct because it uses the correct possessive personal pronouns.

Also 'moderators' I don't know what your dang deal is with always deleting me goddang answers, but when you did it took away 100 points and one of my brainliest answers. So please stop with that.