The answer is "a. Sanskrit".
Sanskrit refers to a languageof old India with an archived history of around 3,500 years. It is the essential formal dialect of Hinduism; the overwhelming dialect of most works of Hindu rationality and a portion of the central writings of Buddhism and Jainism.
Sanskrit is an Old Indo-Aryan language. As one of the most established recorded individuals from the Indo-European group of languages,Sanskrit holds a noticeable position in Indo-European examinations.