Step 1: Definition of Samyak dr̥ṣṭi.
Samyak dr̥ṣṭi means right view or right understanding. It is very important in the Buddha's fundamental teachings.
Step 2: The Noble Eightfold Path.
The Eightfold Path has eight components—Samyak dr̥ṣṭi, Samyak saṅkalpa, Samyak vāk, Samyak karmānta, Samyak ājīva, Samyak vyāyāma, Samyak smṛti, Samyak samādhi.
Among these, Samyak dr̥ṣṭi is the first, forming the basis for all other components.
Step 3: Analysis of Options.
(1) Ārya satya: There are four Noble Truths, but the term Samyak dr̥ṣṭi is not present here.
(2) Pratītya samutpāda: This is a theory of causation; the concept of 'dr̥ṣṭi' is not here.
(3) Aṣṭāṅgika Mārga: Absolutely correct. Samyak dr̥ṣṭi is the first among its eight components.
(4) Brahmavihāras: Represents loving-kindness, compassion, sympathetic joy, and equanimity; Samyak dr̥ṣṭi is not here.
Step 4: Conclusion.
The correct answer to this question is—Aṣṭāṅgika Mārga.