Please help me with the following questions, thank you a lot.

1. I think it is illogical to say "enter the door." It would be better to say "enter the house/room/etc.," or "enter through the door." Please correct me if I am wrong.

2. Dad said you are a good boy, (A. didn't he B. aren't you)? Which one should I choose?

3. Dad said the movie was interesting, (A. didn't he B. wasn't it)? Which one should I choose?