I used to own a dog. People came to the door. The dog never barked at them.
A.The dog I used to own never barked at people whose came to the door.
B.The dog I used to own never barked at people who came to the door.
C.The dog I used to own never barked at people whom came to the door.
D.The dog that I used to own never barked at people came to the door.

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