Great game, i got two endings in A and two in B, one in C, but where is the last ending? Well, I think, the devil imitates....
Scenario B 3rd Ending:
Don't watch the DVD and go back upstairs
Use the bent knife on the tub to receive the key.
Unlock the door on the second floor.
Go straight and then turn left into the basement.
Walk up to the window and escape.
Go around the house to the front door and press accept.
After the dialogue finishes, go to the neighbors house to your right.