Step 1: Recall the Niyamas.
In Patanjali's Yoga Sutra the five Niyamas are Sauca (purity), Santosa (contentment), Tapas (discipline), Svadhyaya (self study) and Ishvara-pranidhana (surrender to God). The paper lists four of them.
Step 2: Place A, Sauca.
Sauca is the first Niyama. A comes first.
Step 3: Place D, Santosa.
Santosa is the second Niyama, so D comes second.
Step 4: Place B, Tapas.
Tapas is the third Niyama, so B comes third.
Step 5: Place C, Svadhyaya.
Svadhyaya is the fourth Niyama, so C comes fourth. The required order is A, D, B, C.
Step 6: Check each option.
Option 1 (A, B, C, D) puts Tapas before Santosa, which is wrong. Option 2 (A, D, B, C) matches exactly. Option 3 (B, A, D, C) starts with Tapas, which is wrong. Option 4 (C, B, D, A) starts with Svadhyaya, which is wrong.
Final Answer:
The order Sauca, Santosa, Tapas, Svadhyaya is A, D, B, C, which is option 2 as printed in the paper.
\[ \boxed{\text{A, D, B, C (Option 2)}} \]