The language of discourses of Gautama Buddha was?
(A) Sanskrit
(B) Pali
(C) Magadhi
(D) Bhojpuri

Hint: Buddha (Siddhartha Gautama) was born, a teacher, philosopher, and spiritual leader, and is considered the founder of Buddhism. Buddha means "a person who is awakened" or "an enlightened person". Although scholars agree that the Buddha does exist, the specific dates and events in his life are still being debated.

Complete answer:
Buddha language: Theravada notes refer to Pali “Magadha" or "Magadha language". This recognition first appeared in the commentary, probably because the Buddhists tried to connect themselves more closely with the Mauritian Empire.
The Buddha’s teachings were spread in the historical territory of the Magadha Kingdom. Scholars believe that the Buddha’s teachings may have been taught in several closely related dialects of the Sino-Indian Aryan language. These dialects have a high degree of mutuality.
Understanding The Theravada tradition recorded in chronicles such as the Mahavamsa pointed out that Tipitaka was first devoted to writing in the first century BC. This shift from an oral preservation tradition is described as being increasingly influenced by famine, war, and the opposing traditions of Abhayagiri Vihara.
 Although there are signs that Parley had begun to record in writing before this date, scholars generally accepted this statement. At this point in its history, scholars believe that Palli may have been initially assimilated with Sanskrit, such as transforming the Central Indian Bahamas into contemporary Brahman's Sanskrit Brahmana.

Thus, the option (B) is correct

Note: Sanskrit is a classical language that was popular in India thousands of years ago, but has lost its glory in modern times. Pali is also an ancient language and has been widely used in Buddhist scriptures. Sanskrit is much older than Pali. Sanskrit is the language used during the Vedic period