Option a is the correct answer. The Rigveda is recognized as the oldest religious text in the world, consisting of ten mandalas. The tenth mandala contains 191 hymns, and among them is the Surya Sukta, a hymn that reflects upon marriage ceremonies. Important Tips Rig Veda, often referred to as the 'first testament of mankind,' is believed to have been composed between 1500-1200 B.C. It is a comprehensive collection of ancient scriptures consisting of 10 , 600 10,600 verses and 1,028 hymns. The text is divided into 10 sections called books or mandalas. Each mandala is further divided into smaller hymns known as suktas, which collectively contribute to the rich content of the Rig Veda. The Varna system, mentioned in Rig Veda, classifies individuals into different social groups or varnas based on their occupation and social standing. The Rig Veda contains profound insights into various aspects such as the origins of the universe, the deities Lord Shiva and Lord Varuna, and other significant secrets that provide a deeper understanding of Hindu cosmology and theology.