A) the death of his father
b) the attack by fortinbras
c) ophelia’s suicide
d) the accidental murder of polonius

The answer is a. the death of his father.  Apart from this it was the marriage of his mother Gertrude to Claudius, his uncle.  They thought this traumatized him.  In reality, he feigned insanity so that no one would know he was trying to prove his father died because of his uncle.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.

just don't strip down in public lol