I presume that the question is about the Shakespere´s play Hamlet. The correct answer is C) from a snakebite.
After being spotted a ghost that looked like the recent deceased King Hamlet walking by the Castle´s hallways Horatio, a friend of Prince Hamlet, looked for the prince to watch that figure.
In the scene V of the Act I is were the ghost finally spoke to his son revealing that he is indeed his decesed father and gives a full account of his murder and the false explanation that was given to the public.
The King´s ghost told:
"Tis given out that, sleeping in my orchard,
A serpent stung me. So the whole ear of Denmark
Is by a forged process of my death
Rankly abused"
Here we can see that the ghost is claiming about how the Danish people were told a lie that a serpent bite the king and that produced his death.
He then told Prince Hamlet that his death was at the hands of Claudius who did it to take the throne and his wife. And the ghost exort Hamlet to take revenge over his death because the now King has corrupted Denmark.
When Horatio and a watchmen arrived soon after the ghost vanished and asked Hamlet what had the ghost told him he denies to tell them and announced to his friend that he was going to pretend to be a madman so no one could noticed that he knew the awfull true.
I hope this answer help you and that it is correct. Greetings.