What is the gender neutral version of his or her?
Please don't say it or its.
For singular pronouns, English doesn't have a gender-neutral word other than it. If you really want to avoid specifying gender, you'll have to say "the ___" instead of using pronouns.
"The" usually works
does it really matter
Them, their, they, theirs.
In the olden days, the gender neutral word for a group of kids was "girls".
"His" and "Her" are possessive forms so the answer is "Their" His appleHer appleTheir apple (their can be singular as well as plural)
In proper English, their is no gender neutral pronoun for his/her. You can do his/her, but it's actually more correct to just use his or her.
Their, one, this one, that one, they. Them.