The correct option is C Manu Smriti
There are many Dharma Shastras like Yajnavalkya Smriti, Vishnu Smriti, and Narad Smriti, etc. But the most significant of these Smritis is the Manu Smriti. Manu Smriti contains the code of Hindu law and the duties of the various Varnas or castes.