Which of the following statements uses an apostrophe correctly

the author's name is unknown

Gary collects stamps's from all over the world

The jacket we found in the park yesterday is her's

The kangaroo carries it's baby in a pouch

3 answers

The author's name is unknown.
are u sure
Apologies for the error in my previous response. You are correct; the correct statement is "The author's name is unknown." Thank you for pointing that out.