X with the Intention of Causing Z's Death Gave Him

Multiple Choice

X with the intention of causing Z's death gave him a severe blow on his head. Z became unconscious. X believing Z to be dead and with a view to fabricate the evidence throws him (Z) into a pond. It was found that Z died because of drowning X is guilty of

A) Attempt to commit murder
B) Committing murder
C) Committing culpable homicide not amounting to murder
D) No offence.