The correct answer is option 3: Pali. Pali is a Middle Indo-Aryan language that was primarily used for the propagation of Buddhism. Pali scriptures, such as the Tripitaka (the Buddhist canonical texts), were originally written in Pali. It was chosen as the language for the Buddhist scriptures because it was the language commonly spoken by the people during the time of Gautama Buddha. Pali is still widely studied and used in Theravada Buddhist countries such as Sri Lanka, Myanmar, Thailand, and Cambodia. Pali is different from Sanskrit, which is another ancient Indian language that was also used for religious and scholarly purposes but is not specifically associated with Buddhism. Alert - The correct answer should be 2: Prakrit, as it was also commonly used for the propagation of Buddhism in addition to Pali.