Gary Hires Doug to Burn Off His Fields to Kill

Gary hires Doug to burn off his fields to kill the weeds. If the fire gets out of control because of Doug's negligence and the fire damages Philip's wood fence:

A) Gary has no liability because Doug was an independent contractor.
B) Doug bears sole responsibility for damage to the fence because it was his negligence that caused the fire to escape the intended boundaries.
C) Gary is vicariously liable because he authorized an abnormally dangerous activity.
D) Philip cannot hold Gary liable unless Gary was personally involved in the act of burning the fields.