A Shot at B with a View to Kill Him

A shot at B with a view to kill him. When B was being taken to the hospital, a tree fall upon B on the way and B died in the hospital a few days later. If it was proved that the falling of the tree caused B's death then:

A) A shall be responsible for the death of B.
B) Falling of tree has broken the chain of causation
C) A is not liable to pay an compensation to the dependants of B
D) None of the above statements is correct.