The correct answer is: d) Bonfires and feasting.
Cheiraoba is a festival celebrated by the Meitei people of Manipur, India. It is a harvest festival that marks the end of the agricultural year. The festival is celebrated with great pomp and show, with people gathering in large groups to feast, dance, and sing. Bonfires are also lit to ward off evil spirits and to welcome the good harvest.
Option a) is incorrect because climbing a greased pole is not a tradition associated with Cheiraoba. Option b) is incorrect because releasing lanterns is not a tradition associated with Cheiraoba. Option c) is incorrect because offering prayers on hilltops is not a tradition associated with Cheiraoba.