By , an archaic form of Sanskrit, an Indo-European language, had diffused into India from the northwest,   (c)   (d)   (e)  Quote: "Although the collapse of the Indus valley civilization is no longer believed to have been due to an ‘Aryan invasion’ it is widely thought that, at roughly the same time, or perhaps a few centuries later, new Indo-Aryan-speaking people and influences began to enter the subcontinent from the north-west. Detailed evidence is lacking. Nevertheless, a predecessor of the language that would eventually be called Sanskrit was probably introduced into the north-west sometime between 3,900 and 3,000 years ago. This language was related to one then spoken in eastern Iran; and both of these languages belonged to the Indo-European language family. ... It seems likely that various small-scale migrations were involved in the gradual introduction of the predecessor language and associated cultural characteristics. However, there may not have been a tight relationship between movements of people on the one hand, and changes in language and culture on the other. Moreover, the process whereby a dynamic new force gradually arose—a people with a distinct ideology who eventually seem to have referred to themselves as ‘Arya’—was certainly two-way. That is, it involved a blending of new features which came from outside with other features—probably including some surviving Harappan influences—that were already present. Anyhow, it would be quite a few centuries before Sanskrit was written down. And the hymns and stories of the Arya people—especially the Vedas and the later Mahabharata and Ramayana epics—are poor guides as to historical events. Of course, the emerging Arya were to have a huge impact on the history of the subcontinent. Nevertheless, little is known about their early presence.";  (f)  unfolding as the language of the ''Rigveda'', and recording the dawning of Hinduism in India. (b) ;  (c)  (d) 