I voted other. Yes, teens need to be allowed to have their privacy and heaven knows I went that door closed to keep me from going off when I see a mess! (talking about son and younger years - he was so messy!)
I think there needs to be a happy medium. The child/teen should not wall themselves off from family.
I would be concerned if the teen had to be in the room all the time with the door closed and if I felt they weren't interacting normally with family.
I am at the last of the teen years with my youngest child. I think for us it's a happy medium. She closes the door but I am free to open it. She goes to college plus works a part time job and has a lot of responsibilities. Although she;s living at home still, I think she's proven that she can make responsible decisions. I don't expect to open the door and be surprised by anything I wouldn't approve of.
I think it depends on your child. The poster named QueentoprincessG may have already had an unacceptable experience, while I have not. So she has that experience. She may know what it is like to have a child doing drugs, smoking or drinking, or having sex in their closed door room, or has people she knows where that goes on. These things are all possible with teens. I am sure if any of these signs were visible to most of us, we would not condone much privacy either.