In Hinduism and Buddhism, nirvana is basically the highest state that someone can attain, a state of enlightenment, meaning a person's desires and suffering go away and that person is released from the effects of karma and the cycle of death and rebirth. Therefore, the correct answer is c. free from suffering.
Here is a website where you can read more about this...
https://www.learnreligions.com/nirvana-449567
Hope that helps!
