The word “Bihar” originally means “Land of Aryas”. Aryas were a group of Indo-Aryan people who migrated to India from Central Asia around 1500 BC. They brought with them the Sanskrit language and the Hindu religion. The word “Bihar” is derived from the Sanskrit word “Vihar”, which means “monastery”. This is because the Aryans were the first people to build monasteries in India.
Option A is incorrect because a Buddhist monastery is a place where Buddhist monks live and practice their religion. The word “Bihar” does not mean “Buddhist monastery”.
Option B is incorrect because the word “Bihar” does not mean “Land of Angels”. The word “angel” is a Christian term, and the Aryans were not Christians.
Option C is incorrect because the word “Bihar” does not mean “Arya Pradesh”. The word “Arya Pradesh” is a modern term that refers to the Indian state of Bihar. The word “Bihar” is much older than the state of Bihar.
Option D is incorrect because the word “Bihar” does not mean “Land of Greenery”. The word “greenery” is a modern term that refers to the presence of trees and plants. The word “Bihar” is much older than the concept of greenery.