Which sentence contains a contraction that is formed incorrectly?

a. isn't gina's new haircut cute?

b. i think thats the dog's food bowl.

c. we'll be at grandma and grandpa's apartment soon.

d. i'm glad we didn't get caught in the storm earlier.

The right answer for the question that is being asked and shown above is that: "B.I think thats the dog's food bowl." the sentence that contains a contraction that is formed incorrectly is this B.I think thats the dog's food bowl. because of the word 'thats'

Example support i believe : )