Circle the correct option:a, b or c.

Witaj :)
1. That is their car
2. Is that notebook yours?
3. I think that's Steve's house.
4. The students' new teacher is really nice.
5. That's not their house. Theirs is white, not yellow.
6. It's his problem, not ours!
7. I think her flat is on the fourth floor.
8. The childrens toys are in the hallway.
9. Whose jacket is this? It's not mine.
10. Is that your sister's new wardrobe?