Which form of a possessive pronoun correctly completes the sentence?

Carol laid the book on __________ side on the desk.

A.
its

B.
its'

C.
it

D.
it's

Question

Which form of a possessive pronoun correctly completes the sentence? 

Carol laid the book on __________ side on the desk.
 
 A.
its
 
 B.
its'
 
 C.
it
 
 D.
it's

anonymous · Answer

Not B not C
Whats D and A different like how?
@TheAsker2002

anonymous · Answer

Hold on

anonymous · Answer

Its' does not exist. We see it all the time, and we've probably all used it at some point, but there is no such thing as its'. So delete it from your memory bank. Said in here http://missadventureporting.blogspot.com/2011/05/grammar-girl-battle-of-its-vs-its-vs.html

anonymous · Answer

I know B is wrong LOL and C
but the difference between A and D?

anonymous · Answer

Carol laid the book on it is side on the desk/.
Carol  laid the book on it has side.

anonymous · Answer

So its a

anonymous · Answer

Thanks!!