X' and 'Y' swimming in the sea, after a shipwreck got hold of a plank. The plank was not large enough to support both 'X' with no other option, pushed 'Y' who was drowned. 'X' has committed:
A. Culpable homicide
B. Murder
C. The offence of causing death by negligence
D. No offence
Answer: Option D

what happened to prevention of harm to the accused at that of an innocent person is not a valid excuse? and can't be pleased as a defense