The correct answer is "it's." Every sentence needs a verb and here it is to be : "it is."
"Its" is a possessive adjective.
The dog is licking its paws.
I hope this helps
Stephen
The correct answer is - It's
Explanation: It's is a short form of It is. On the other hand its defines something belonging to something, e.g. What is the color of Apple? = its color is red.
I hope my answer is clear to you. By the way, English is not my native language, neither is Spanish but I teach people these two languages as my hobby.