Answer:
He causes Hamlet to seek revenge against Claudius.
Step-by-step explanation:
According to the play "Hamlet" by William Shakespeare, the ghost of Hamlet's father contributes to the rising action of the play by causing Hamlet to seek revenge against Claudius.
When the ghost of Hamlet's father appears, he let's Hamlet know that he was murdered by Claudius, his brother and that Hamlet must avenge his death.
In literary terms, rising action is the period of a story where conflicts are reached and there is suspense as a result of this conflict.