Step 1: Conceptual Understanding:
The objective is to match the Niyamas, the second of Patanjali's eight limbs of yoga, with their corresponding English definitions.
Step 2: Detailed Definitions and Matches:
Each Niyama from List-I is defined and matched with its description in List-II.
(A) Śauca: Defined as purity and cleanliness, encompassing both external (body) and internal (mind, speech, thoughts) aspects. This aligns with (I) Purity of body, mind, thought.
(B) Santoṣa: This term signifies contentment, the practice of accepting and appreciating one's current circumstances without craving the unattainable. This matches (II) Positive Contentment.
(C) Tapas: Refers to austerity, self-discipline, and the spiritual endeavor or "heat" that purifies the mind and body, fostering willpower. This corresponds to (IV) Austerity.
(D) Svādhyāya: This means self-study or introspection, including the examination of sacred texts for self-realization. This aligns with (III) Self-study, introspection.
Step 3: Conclusion:
The established correct pairings are:
A - I
B - II
C - IV
D - III
This set of matches corresponds to option (2).