Answer:
1) a. kids
2) b. cat's
3) c. books'
4) a. bottles
Step-by-step explanation:
1) "Kids" is just plural, so it doesn't need any apostrophes.
2) "Cat's" is possessive because the sentence is talking about one of the cat's fur.
3) "Books'" is possessive plural because the sentence is stating facts about all of the books' covers.
4) "Bottles" is only plural, so it doesn't need any apostrophes.
Hope this helps!! Have an amazing day (●'◡'●)