re: Traffic Accident - Who's Fault?

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The only real answer: who do I represent?

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Exactly

Assuming the facts the OP presented are accurate, then I would suspect Car A would be at fault. Likely, Car A had a duty to ensure that he could perform the act of opening his door without causing damage to another's person or property. As far as I know, there is no duty for Car B to wait to enter the parking space until the person in Car A has opened his door and exited the vehicle. The exception may be if Car B observed the person in Car A open his door prior to Car B turning into the parking space.