66) Sanatsujātīya is the discourse given by Sanatsujāta toa.Bhīmab.Karṇac.Duryodhanad.Dhṛtarāṣṭra

The Sanatsujātīya is a significant text found within the Indian epic, the Mahabharata. It is delivered by the sage Sanatsujāta, who imparts spiritual wisdom and philosophical insights primarily to Dhṛtarāṣṭra, the blind king of Hastinapura.

In this discourse, Sanatsujāta addresses the nature of reality, the impermanence of life, and the path of self-realization and detachment. This philosophical dialogue emphasizes understanding the self and the transient nature of the material world. The teachings in the Sanatsujātīya encourage contemplation on the deeper aspects of existence beyond the immediate concerns of power and conflict, which are central themes in the Mahabharata.

Thus, the correct answer to your question is:

d. Dhṛtarāṣṭra