The question asks to identify the Veda associated with Āraṇyagāna. Āraṇyagāna refers to texts intended for study in the forest, often containing chants and musical elements.
Among the four Vedas, the Sāmaveda is primarily known for its structure based on chants (Sāman) and melodies, derived largely from the Ṛgveda but arranged for liturgical purposes. Its content is deeply connected with singing and ritual chanting.
The Āraṇyaka portions of the Vedas, which include the Āraṇyagāna, delve into deeper philosophical and ritualistic meanings suitable for hermits or those living in forests. The Sāmaveda's emphasis on chanting aligns perfectly with the nature of Āraṇyagāna.
Therefore, the Veda related to Āraṇyagāna is the Sāmaveda.
The correct option is 2. Sāmaveda.