The correct option is A Manikkavacakar
Thiruvasagam is a volume of Tamil hymns composed by the ninth century Shaivite bhakti poet Manikkavasagar. It contains 51 compositions and constitutes the eighth volume of the Tirumurai, the sacred anthology of Tamil Shaiva Siddhanta.
Most of the portions in Thiruvasagam were first sung in Thillai Nataraja Temple at Chidambaram. It is considered one of the profound works of Tamil literature and it discusses every phase of spiritual path from doubt and anguish to perfect understanding in Shiva, from earthly experience to teacher-disciple relationship and ultimately freedom from rebirth.