Concept:
The sutra:
\[
\textit{Tadā Draṣṭuḥ Svarūpe'vasthānam}
\]
is from the Patanjali Yoga Sutra (Chapter 1, Sutra 3).
It means:
\[
\text{``Then the Seer abides in his own true nature.''}
\]
Here, “Draṣṭā” or “Dhṛashta” means the Seer, the witnessing consciousness, which in Yoga philosophy refers to the Purusha — the pure conscious Self.
Step 1: Understand the meaning of the sutra.
The sutra appears after the definition of Yoga:
\[
\textit{Yogaś chitta-vṛtti-nirodhaḥ}
\]
which means:
\[
\text{Yoga is the cessation of mental modifications.}
\]
When the fluctuations of the mind stop:
\[
\textit{Tadā Draṣṭuḥ Svarūpe'vasthānam}
\]
that is:
\[
\text{The Seer remains established in its true nature.}
\]
Step 2: Identify who the “Dhṛashta” is.
In Yoga philosophy:
\[
\text{Dhṛashta (Draṣṭā)} = \text{Purusha}
\]
Purusha is the eternal witnessing consciousness, separate from mind and matter.
Step 3: Analyze the given options.
Option (A): Purush
Purusha is the witnessing Self or Seer. This correctly represents the meaning of “Dhṛashta.”
Option (B): Prakṛiti
Prakriti refers to material nature and not the witnessing consciousness.
Option (C): Buddhi
Buddhi means intellect or discriminative faculty, which is part of Prakriti.
Option (D): Ishwar
Ishwar refers to the special Purusha or supreme consciousness, but the sutra specifically refers to the individual witnessing Self.
Step 4: Identify the correct option.
Since “Dhṛashta” refers to the witnessing consciousness or Seer, the correct answer is:
\[
\boxed{\text{Purush}}
\]