Concept:The Vedas are the oldest sacred texts of Hinduism. The Rigveda is the earliest and most important among the four Vedas.
Explanation:Vedas are the first religious and literary sources of ancient India. They are four – Rigveda, Samveda, Yajurveda, and Atharvaveda.
Rigveda is the oldest Veda, composed around 1500–1200 BCE. It contains hymns and knowledge of chemistry, medicine, and rituals.
The Gayatri mantra and the Purusha Sukta are found in the Rigveda. Its 10 mandalas (books) are the earliest written records.
Samveda deals with music, Yajurveda with sacrificial formulas, and Atharvaveda with Ayurveda and spells.
Thus, the Rigveda is the first literacy source among the options.
Answer:A. Rigveda