Step 1: Understanding the Question:
We must put the four asanas in the order of their posture type: standing, sitting, prone (lying on the stomach) and supine (lying on the back).
Step 2: Key Idea:
Padahastasana is a standing forward bend. Ustrasana (camel pose) is placed in the sitting (kneeling) group. Shalabhasana (locust pose) is done lying on the stomach, so it is prone. Sarvangasana (shoulder stand) is done lying on the back, so it is supine. The required order is A, B, D, C.
Step 3: Check option (1).
The order A, B, C, D puts Sarvangasana (supine) in the prone place and Shalabhasana (prone) in the supine place. The last two are swapped. So option (1) is wrong.
Step 4: Check option (2).
The order A, B, D, C gives standing (A), sitting (B), prone (D), supine (C). This is exactly what is asked. So option (2) is right.
Step 5: Check option (3).
The order B, A, D, C starts with the sitting pose, but the first place must be a standing pose. So option (3) is wrong.
Step 6: Check option (4).
The order C, B, D, A starts with a supine pose and ends with a standing pose. It is not the order asked. So option (4) is wrong.
Final Answer:
The correct sequence is A, B, D, C, option (2).