The correct answer is A. Vishvamitra.
Audumbara is the name of the descendant of sage Vishvamitra. He was a king of the Iká¹£vÄku dynasty and the son of king Hariscandra. Audumbara was a great warrior and a wise ruler. He was also a patron of the arts and sciences.
Vishvamitra was a sage who was born in the family of a Kshatriya. He was a great warrior and a powerful ruler. He was also a learned scholar and a great devotee of Lord Vishnu. He is one of the Saptarishis, the seven sages who are said to have composed the Vedas.
Vashistha was a sage who was born in the family of a Brahmin. He was a great scholar and a powerful magician. He was also a great devotee of Lord Vishnu. He is one of the Saptarishis, the seven sages who are said to have composed the Vedas.
Gantama was a sage who was born in the family of a Kshatriya. He was a great warrior and a powerful ruler. He was also a learned scholar and a great devotee of Lord Vishnu. He is one of the Saptarishis, the seven sages who are said to have composed the Vedas.
Patanjali was a sage who was born in the family of a Brahmin. He was a great scholar and a powerful grammarian. He is also the author of the Yoga Sutras, a treatise on yoga philosophy.