No matter how you die, B can't get rid of the charge of murder. The court will only agree with the first inference of the two statements you mentioned above: A was killed and dumped by B, but your second inference cannot be established. Since you are drunk, how can you overcome it?
Therefore, A can't escape criminal responsibility. Now we can only look at A's guilty attitude. If it is good, it may be suspended. If it is not good, it must be the death penalty or more than 20 years in prison.
As for compensation, it depends on B's income source and family property, which can't be judged.