Option c is the correct answer. Gautam Buddha achieved Mahaparinirvana in Kushinagar, which is in Malla Kingdom. It was located in present day Uttar Pradesh. Mahaparinirvana represents the supreme state of Nirvana, the ultimate peace and happiness achieved by an Enlightened Being. Kushinagar serves as the last resting spot for Gautam Buddha and is an important Buddhist pilgrimage destination.