The correct answer is (a) Mayur Sharman.
Hiranya-Garbha is a Vedic ritual performed to invoke the blessings of the god Vishnu. It is a complex and elaborate ritual that involves the recitation of mantras, the offering of sacrifices, and the construction of a sacred fire. The ritual is said to have been performed by the sage Mayur Sharman, who is said to have been the son of the sage Agastya.
Mayur Sharman was a great Vedic scholar and a renowned teacher. He is said to have been the author of several important works on Vedic philosophy and ritual. He is also said to have been the founder of the Mayuraksha school of Vedic thought.
The Hiranya-Garbha ritual is said to have been performed by Mayur Sharman in order to obtain the blessings of Vishnu. The ritual is said to have been successful, and Mayur Sharman is said to have attained great spiritual power as a result.
The other options are incorrect because they are not associated with the Hiranya-Garbha ritual. Harichandra was a king who is said to have been the son of the sage Vishwamitra. Danti Durga was a goddess who is said to have been the consort of the god Shiva. Harsha was a king who is said to have ruled over the Indian subcontinent in the 7th century CE.