Buddhist Ethics are fundamentally grounded in the teachings of the Buddha, particularly the Four Noble Truths:
\begin{enumerate}
The truth of suffering (duḥkha)
The cause of suffering (samudaya)
The cessation of suffering (nirodha)
The path leading to the cessation of suffering (mārga)
\end{enumerate}
These form the ethical and philosophical core of Buddhism. The Eightfold Path that arises from the fourth truth lays out ethical conduct, mental discipline, and wisdom.
Explanation of Other Options:
(A) Vidura is associated with ethical teachings in the Mahabharata, not Buddhist ethics.
(B) Discourse on polity is found in texts like the Arthashastra, not in Buddhist ethical scriptures.
(C) Darśanaśāstra relates to schools of Indian philosophy, whereas Buddhist ethics have their own doctrinal basis.