Step 1: Understanding the Concept:
The question asks to arrange four specific Carnatic swaras in ascending order of their pitch. This requires knowledge of the 12 swarasthanas (note positions) in an octave.
Step 2: Detailed Explanation:
The 12 swarasthanas in increasing order of pitch are:
S, Suddha Rishabha (R1), Chatushruti Rishabha (R2), Sadharana Gandhara (G2), Antara Gandhara (G3), Suddha Madhyama (M1), Prati Madhyama (M2), P, Suddha Dhaivata (D1), Chatushruti Dhaivata (D2), Kaisiki Nishada (N2), Kakali Nishada (N3).
Let's place the given swaras in this sequence:
1. (A) Suddha Rishabha (R1)
2. (C) Antara Gandhara (G3)
3. (B) Prati Madhyama (M2)
4. (D) Kaisiki Nishada (N2)
Therefore, the correct sequence in increasing order of pitch is A, C, B, D.
Step 3: Final Answer:
The correct ascending order of the given swaras is (A) Suddha Rishabha, (C) Antara Gandhara, (B) Prati Madhyama, (D) Kaisiki Nishada.