Which of the following sentences is punctuated correctly?

a

The bookstore had to move its collection of children’s books.
b

The bookstore had to move it’s collection of childrens’ books.
c

The bookstore had to move its’ collection of children’s books.
d

The bookstore had to move its’ collection of childrens’ books

The correct sentence is "The bookstore had to move its collection of children’s books." (a)

The correct punctuated sentence is:

a

The bookstore had to move its collection of children’s books.